. . LIBRARY . .

Connecticut Agricultural College.

VOL i..D...3.3.A

CLASS NO 3..3.0.

COST... S..iLt.

DATE ,\-^irsZ>...4 190..5...

DEPARTMENT OF THE INTERIOR

MONOGRAPHS

United States Geological Survey

VOLUME XLVIII

Part II.-PL^TES.

WASHINGTON

GOVERNMENT PRINTING OFFICE

1905

Digitized by the Internet Archive

in 2009 with funding from

Boston Library Consortium IVIember Libraries

http://www.archive.org/details/statusofmesozoicOOward

UNITED STATES GEOLOGICAL SURVEY

CHARLES D. WALCOTT, Director

STATUS

MESOZOIC FLORAS OF THE UNITED STATES

BY

LESTER F. WARD

with the collaboration op

William M. Fontaine, Arthur Bibbins, and G. R. Wieland

I'art II.-i^LATES.

O

WASHINGTON

government printing office 1905

038"^.

LIST OF THE PLATES.

Plate.

Coniferous plants from the Trias of Arizona i-iil

Sketch map of the Little Colorado Vallej', Arizona, and adjacent regions iv

Sketch map of the Buck Mountain region and Cow Creek Valley, Douglas County, Oreg v

Jurassic liverworts and ferns from Oregon. vi

Jurassic ferns from Oregon vii-xiv

Jurassic ferns and Equiseta from Oregon xv

Jurassic cycads from Oregon xvi-xxviii

Jurassic cycads and Williarasonias from Oregon xxix

Jurassic Gingkos from Oregon ; xxx-xxxiii

Jurassic Gingkoacese and Taxacese from Oregon xxxiv

Jurassic conifers from Oregon xxxv,xxxvi

Miscellaneous Jurassic plants from Oregon xxxvii

Jurasso-Cretaceous plants from Oregon and Alaska j xxxviii

Jurasso-Cretaceous ferns from Cape Lisburne, Alaska xxxix-XLiii

Jurasso-Cretaceous cycads and Gingkoacese from Cape Lisburne, Alaska XLiv

Jurasso-Cretaceous conifers from Alaska, Montana, and California _ XLV

Jurassic cycads from Wyoming xlvi-lxiii

Sketch map showing fossil localities of the Shasta formation of California lxiv

Ferns from the Shasta formation of California and Oregon lxv-lxvi

Cycads from the Shasta formation of California and Oregon lxvii

Cycads and conifers from the Shasta formation of California and Oregon Lxviii

Conifers and dicotyledons from the Shasta formation of California and Oregon Lxix

Cycadean trunk from the Shasta formation of California _ lxx

. Ferns from the Kootanie formation of Montana lxxi

Equiseta and cycads from the Kootanie formation of Montana Lxxii

Cycads and conifers from the Kootanie formation of Montana and the Lakota formation of

South Dakota Lxxiir

Exposure of the Potomac formation on Ontario avenue, Washington, D. C. lxxiv

Exposure of the Potomac formation on Kansas avenue, Washington, D. C lxxv

Exposure of the Potomac formation on Sixteenth street, Washington, D. C. lxxvi

Exposures of the Potomac formation at Terra Cotta, D. C Lxxvii

Exposures of the Potomac formation at Freestone, Virginia Lxxvm

Exposures of the Potomac formation on Back Lick Run, Virginia lxxi.x

Map of the Potomac terrane in Maryland, the District of Columbia, and adjacent parts of

Virginia lxxx

VI LIST OF THE PLATES.

Plate.

Cycad trunk and silieiBed wood from the Potomac of Maryland. lxxxi

Trunks of cycads early discovered in the Potomac of Maryland lxxxii-lxxxvi

Group of cycads in the Museum of the Woman's College of Baltimore Lxxxvii

View of the Link Gulch with the Link cycad in place lxxxyiii

Group of cycads in the Museum of the Woman's College of Baltimore Lxxxix

Cycadeoidea marylandica xo-xcii

Cycadeoidea Tysoniana xciii

Cycadeoidea McGeeana xciv

Cycadeoidea Fontaineana xcv-xcviii

Cycadeoidea Goucheriana xcix

Cycadeoidea Uhleri c

Cycadeoidea Bibbinsi ci-civ

Cycadeoidea Fisherje cv

Cycadeoidea Clarkiana cvi

Fossil plants from the Potomac of Virginia, the District of Columbia, and Maryland cvii-cxix

PLATE I.

Triassic Flora of Arizona.

Akaucarites shinabumpbnsis Ward n. sp -.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIIl PL. I

CONIFEROUS PLANTS FROM THE TRIAS OF ARIZONA.

PLATE II.

Triassic Flora of Arizona.

Page. Figs. 1, 2. Araucarites shinarumpensis Ward n. sp - 30

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL.

CONIFEROUS PLANTS FROM THE TRIAS OF ARIZONA.

PLATE III.

Triassic Flora of Arizona.

Akaucarites monilifer Ward n. sp

Figs. 1,2. Views of the outer surface of the resinous bodies found in the interior of silicified stumps. ., . Fig. 3. View of the interior of one of the same split longitudinallj- through the center. Fig. 4. View of a cross section of one of the same.

Fig 5. View of a piece of the wood from the interior of a stump with three of t!ie resinous bodies attached to it, showing their moniliform arrangement.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL.

CONIFEROUS PLANTS FROM THE TRIAS OF ARIZONA.

PLATE IT.

PLATE IV.

Sketch map of tbe Little Colorado Valley, Arizona, and adjacent regions.

PLATE V.

Page. Sketch map of the But-k Mountain region and part of the Cow Creek Valley, Douglas County, Oieg. , . 47

PLATE VI.

MON XLVUI — VOL 2 — 05 2

PLATE VI.

Jurassic Flora of Oregon.

Page.

FiCi. 1. Marchantites ekectus (Bean) Sew.? 53

Fig. 2. Enlargement of Fig. 1, X 2. Fios. 3-9. DicKSONiA oREGONENSis Font. n. sp 55

Fig. 4. Pinnule of Fig. 3 enlarged, X 2. Fig. 6. Pinnule of Fig. 5 enlarged, X 2. Fig. 7. Portion of Fig. 5 slightly enlarged. Fig. 9. Pinnule of Fig. 8 enlarged, X 2. ,

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. VI

JURASSIC LIVERWORTS AND FERNS FROM OREGON.

PLATE VII.

, PLATE VII.

Jurassic Flora of Oregon.

Figs. 1-10. Dicksonia obegonensis Font. n. sp

Fig. 3. Pinnule of Fig. 2 enlarged, X 2.

Figs. 6-8. Enlarged sterile pinnules showing nervation, X 2.

Fig. 9. Enlarged fertile pinnules showing a sorus, X 2.

Fig. 10. Fertile pinnule showing one sorus somewhat more enlarged than Fi;

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. VII

JURASSIC FERNS FROM OREGON.

PLATE VIII.

Jurassic Flora of Oregon.

Page. Figs. 1-3. Coniopteris hv.menophylloides (Brongn.) Sew --. 59

Figs. 2, 3. Enlarged pinnules of Fig. 1 showing sori, X 2. Figs. 4-1 1 . Thyrsopteris MuRR.4Y.iN.i (Brongn. ) Heer ...'..._ 61

Fig. 5. Enlarged pinnule of Fig. 4, X 3. Fig. 6. Enlarged pinnule of Fig. 4, X 2. Fig. 8. Enlarged pinnules of Fig. 7, X 2. Fig. 10. Enlarged pinnule of Fig. 9, X 4. Fig. 11. Enlarged pinnule of Fig. 9, X 2.

Figs. 12-1.5. Folypodiuji oreoonense Font. n.sp.._ 63

Fig. 13. Enlarged pinnule of Fig. 12, X 2. Fig. li. Portion of a pinnule of Fig. 12 X 4.

U. S. QEOLOQICAL SURVEY

MONOGRAPH XLVIII PL. VIM

JURASSIC FERNS FROM OREGON.

PLATE IX.

Jurassic Flora of Oregon.

Page.

Figs. 1-S. Polypodium okboonensb Font. n. sp 63

Fig. 2. Enlarged pinna of Fig. 1, X 2. Figs. 4, 5. Enlarged pinnules of Fig. 3, X 2. Fig. 8. Enlarged pinnule of Fig. 7, X 2.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. IX

JURASSIC FERNS FROM OREGON.

PLATE X

PLATE X.

Jurassic Flora of Oregon.

Page. Figs. 1-7. Poi.vpodium orbgonense Font. n. sp 63

Fig. 3. Enlarged pinnules of Fig. 2, X 2.

Fig. .5. Portion of a pinnule of Fig. 4 enlarged to show the sori, X 2.

Fig. 6. Enlarged sterile pinnule showing the nervation, X 2.

Fig. 7. Enlarged fertile pinnules showing a sorus, X 2.

Figs. S-12. Cladophlebis vaccensis VA'ard n. sp... 66

Fig. 9. Enlarged pinnule of Fig. S. X 2. Fig. 11. Enlarged pinnule of Fig. 10, X 2.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. X

JURASSIC FERNS FROM OREGON.

PLATE XI

PLATE XI.

Jurassic Flora of Oregon.

Page. Figs. 1-7. Cladophlebis denticul.4ta (Brongn. ) Nath 68

Fig. 2. Enlarged pinnule of Fig. 1, X 3.

Fig. 4. Enlarged pinnules of Fig. 3, X 2.

Fig. 7. Enlarged pinnule showing the nervation. Figs. 8-10. Cladophlebis iiaiburnensis (L. & H. ) Brongn 71

Figs. 9, 10. Enlarged pinnules of Fig. 8, X 2. Figs. 11, 12. Cladophlebis acutiloba (Heer) Font. n. comb 72

Fig. 12. Enlarged pinnule of Fig. 11. Figs. 13-15. Cladophlebis pecopteroides Font. n. sp 73

Figs. 14, 15. Portions of Fig. 13 enlarged, to show the nervation.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XI

JURASSIC FERNS FROM OREGON.

PLATE XII.

Jurassic Flora of Oregon.

Page. Figs. 1-3. Sclekopteris oregonensis Font. n. sp 74

Fig. 2. Enlarged pinna of Fig. 1, X 3.

Fig. 3. Enlarged pinnules of Fig. 1, X 3. Figs. 4-8. Ruffordia G<epperti (Dunk. ) Sew. ? 75

Fig. 5. Enlargement of a portion of Fig. 4, to show tlie .sori.

Fig. 6. Enlarged pinnule of Fig. 4, showing one sorus.

Fig. 8. Enlarged portion of Fig. 7, X 4. Figs. 9-11. Adiantites Nympiiarum Heer? 76

Fig. 10. Enlarged portion of Fig. 9, X 2.

Fig. 11. Supposed original form of pinnule. Figs. 12-17. T^eniopteris orovillensis Font 78

Fig. 13. Enlarged portion of Fig. 12, X 2.

Fig. 17. Enlarged portion of Fig. 16, X 2.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XII

JURASSIC FERNS FROM OREGON.

PLATE XIII.

Jurassic Flora of Oregon.

Page. Figs. 1-3. T.eniopteris major L. & H ^ _ 79

Fig. 2. Enlarged portion of Fig. 1, X 2. Figs. 4-8. T.eniopteris vittata Brongn SO

Fig. 8. Enlarged portion of Fig. 7, X 2. Figs. 9, 10. T.eniopteris? oregonensis Font. n. sp 82

Fig. 10. Enlarged portion of Fig. 9, X 2.

U. S. GEOLOGICAL SURVEY

JURASSIC FERNS FROM OREGON,

PLATE XIT

PLATE XIV.

Jurassic Flora of Oregon.

Figs. 1-4. Macrot.eniopteris caufornica Font..

Fig. 4. Pen drawing of a portion of Fig. 3, natural sizo. Figs. .5-11. Sagenoptebis Giepperti Zigu

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XIV

JURASSIC FERNS FROM OREGON.

PLATE XV.

Jurassic Flora of Oregon.

Page.

Figs. 1-.3. Sagenoptekis PAUcrFOLiA (Phill.) Ward ii. coiiil) 8;j

Figs. 4, .'5. Sagenopteris grandipolia Font. n. sp 87

Fig. 5. Pen drawing of a portion of Fig. 4, natural size. Figs. 6-9. Dan^eopsis Storrsii Font. n. sp 87

Fig. 7. Enlarged pinnule of Fig. 6, X 2.

Fig. 8. Portion of same still further enlarged to show the capsules, X 3.

Fig. 9. Another enlarged pinnule, showing the capsule near tlie base, X 2. Fig. 10. Equisetum ? sp. Font 88

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XV

JURASSIC FERNS AND EQUISETA FROM OREGON.

PLATE XVI.

Jurassic Flora of Oregon.

Figs. 1,2. Ftii.ozamites Leckenbvi (Bean) Nath

Fig. 2. Enlargement of Fig. 1, X 2.

Figs. 3-9. Nilsonia orientalis Heer

Fig. 8. Portion of Fig. 7 enlarged, X 2.

Figs. 10-13. Nilsonia orientalis minor Font. n. var . Fig. 11. Summit of Fig. 10 enlarged, X 2.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XVI

JURASSIC CYCADS FROM OREGON.

PLATE XVIL

PLATE XVII. Jurassic Flora of Oregon.

Page. 1-7. NiLSONiA PARVULA (Heer) Font. n. comb- ^ - - - 92

Fig. 5. Enlarged portion of Fig. 4, X 3. Fig. 7. Enlarged portion of Fig. 6, X 3.

8-10. NiLSONIA NIPPONENSIS Yok - 94

Fig. 9. Pen drawing of a portion of Fig. 8, natural size.

11-14. NiLSONIA coMPTA (Phill.)Gopp - 94

Fig. 12. Enlarged portion of Fig. 11, X 3.

U. S GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XVll

JURASSIC CYCADS FROM OREGON.

PLATE XVIII.

Jurassic Flora of Oregon.

Pa?e. Figs. 1-6. Nilsonia pterophylloides Nath , 90

Fig. 3. Enlarged portion of Fig. 2, X 2. Fig. 6. Enlarged pinna of Fig. .5, X 1-

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XVIII

JURASSIC CYCADS FROM OREGON.

PLATE XIX.

Jurassic Flora of Oregon.

Page Figs. 1-6. Ptekophvllum Nathorsti Schenk 97

Fig. 3. Enlarged portion of Fig. 2, X 2. FiG.s. 7-1 1 . Pterophyllum contighum Schenk 99

Fig. 8. Enlarged portion of Fig. 7, X 2.

Fig. 10. Enlarged portion of Fig. 9, X 2.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XIX

JURASSIC CYCADS FROM OREGON.

PLATE XX.

Jurassic Flora of Oregon.

Page.

Figs. 1-7. Pterophyli.um .eqdale (Brongn.) Nath - - 100

Fig. 3. Enlarged portion of Fig. 2, X 2.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XX

JURASSIC CYCADS FROM OREGON.

PLATE XXI.

PLATE XXI .

Jurassic Flora of Oregon.

Figs. 1-7. Pterophyllum ea.imahalense Morr

Fig. 2. Enlarged portion of Fig. 1, X 2.

Fig. 5. Upper part of Fig. 4, enlarged, X 2. Figs. 8, 9. Pterophyllum minus Brongn. ?.

Fig. 9. Upper half of Fig. 8, enlarged, X 3.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XXI

JURASSIC CYCADS FROM OREGON.

PLATE XXII

PLATE XXII.

Jurassic Flora of Oregon.

Page.

Figs. 1-5. Ctenopiiyllum angustipolium Font 105

Fig. 3. Enlarged portion of Fig. 2, X S.

U. S. GEOLOGICAL SURVEV

MONOGRAPH XLVIll PL. XXII

JURASSIC CYCADS FROM OREGON.

PLATE XXIII.

Jurassic Flora of Oregon.

Page. Ctenophyllum pachynerve Font. n. sp 106

Fig. 4. Enlarged portion of Fig. 3, X 2. Ctenophyllum Wardii Font 107

Figs. 6, 7. Enlarged portions of Fig. 5, X ii- Fig. 12. Pen drawing of Fig. 11, natural size.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVMI PL. XXIII

JURASSIC CYCADS FROM OREGON.

PLATE XXIV.

Jurassic Flora of Oregon.

Page. Figs. 1-10. Podozamifes pdi.chellus Heer.. lOS

Fig. 2. Enlargement of Fig. 1, X 2.

Fig. 4. Enlargement of Fig. 3, X f.

Fig. 9. Enlargement of Fig. 8, X 2. Figs. 11-16. Podozamites pachyphyllus Font. n. sp 109

Fig. 15. Enlargement of Fig. 14, X 1- Figs. 17-20. Podozamites i.anceolatus (L. & H.) Fr. Br 110

Fig. 20. Pen drawing of Fig. 19, natural size.

U. S. QEOLOQICAL SURVEY

MONOGRAPH XLVIII PL. XXIV

JURASSIC CYCAPS FROM OREGON.

PLATE XXV.

JtTRAssic Flora of Orkgon.

Pa?c. Figs. 1—1. Podoz\mites lanceolati's iiiiiior (Sdn'iik) lleer Ill

Fig. 2. Enlargement of Fig. 1, X ji.

Fig. 4. Enlargement of Fig. 3, X 2. Figs. .5-7. Podozamites lanceolatus latifoliu.s (Fr. Br. ) Heer 112

Fig. 6. Enlargement of Fig. 5, X S-

Fig. S. Pouozamite.s ? paciitnervis Font. n. sp 112

Fig. 9. Ctenis sl lcigali.is (Pliill.) Ward n. comb 113

U. S. GEOLOQICAL SURVEY

MONOGRAPH XLVIII PL. XXV

JURASSIC CYCADS FROM OREGON.

PLATE XXVI.

PLATE XX VI .

JtjRAssic Flora of Oregon.

'"iGS. 1-5. Ctenis .<iri.ciCAUi,is (Phill.) Ward n.coiiib. Fig. 2. Enlargement ol' Fig. 1, X i. Fig. 6. Enlargement of Fig. 5, X 3.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVMI PL. XXVI

JURASSIC CYCADS FROM OREGON.

PLATE XXVII.

Jurassic Flora of Oregon.

Figs, l-.'i. Ctenis orovii.lensis Font

Fig. 2. Fragment of a leaflet of Fig. 1, natural .size. Fig. 4. Pen drawing of Fig. 3, natural size.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XXVII

JURASSIC CYCADS FROM OREGON.

PLATE XXVIII.

Jurassic Flora of Orecon.

Fig. 1. CiENis ohovii.le.nsis Font — US

Figs. 2-S. Ctenls (M!andifoli.\ Font 116

Fig. A. Portion of Fig. 3 showing nervation, natural size.

Fig. 6. Basal part of Fig. 5, natural size.

Fig. 8. Pen drawing of Fig. 7 better to show the nervation, natural size.

U. S. QEOLOQICAL SURVEY

MONOGRAPH XLVIII PL. XXVIII

JURASSIC CYCADS FROM OREGON.

PLATE XXIX.

Jurassic Flora of Oregon.

Page.

Fig. 1. Ctenis alricllata Font. >. 117

Ficis. 2, 3. Encephalartopsis '. oregonensis Font. n. sp 117

Fig. 3. Pen drawing of Fig. 2.

Fig. 4. Cycadeospermum okegonense Font. n. sp IIS

Fig. 5. Cycadeospermum ovatum Font. n. sp '. IIS

Fig. 6. Williamsonia oregonensis Font. n. sp IIS

Fig. 7. Williamsonia ? sp. Font. (Bract, No. 1) 119

Figs. 8,9. Williamsonia ? sp. Font. (Bract, No. 2a) 119

Fig. 9. Enlargement of Fig. 8, X 2.

Fic. 10. Williamsonia ? sp. Font. (Bract, No. 2b) 119

Figs. 11,12. Williamsonia ? sp. Font. (Bract, No. 2c) 119

Fig. 12. Enlargement of Fig. 11, X 2.

U. S. QEOLOQICAL SURVEY

MONOQRAPH XLVIII PL. XXIX

JURASSIC CYCADS AND WILLIAMSONIAS FROM OREGON.

PLATE XXX.

Jurassic Flora of Oregon.

Figs. 1-7. Ginkho niGiiATA (Brongii.) Heer .

Fig. 2. Pen drawing of part of Fig. 1 to sliow norviition, natural size.

Fig. 5. Pen drawing of Fig. 4, natural size.

Fig. 7. Pen drawing of Fig. 6, natural size. Figs. 8-12. GrNKGO Huttoni (Sternb.) Heer

Fig. 9. Pen drawing of Fig. 8, natural size.

Fig. 11. Pen drawing of Fig. 10, natural size.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XXX

JURASSIC GINGKOS FROM OREGON.

PLATE XXXI.

PLATE XXXI. Jurassic Flora of Oregon.

Page. Figs. 1-3. Ginkgo Huttoni (Sternb.) Heer 123

Fig. 3. Pen drawing of Fig. 2, natural size.

Figs. 4-8. Ginkgo Huttoni Magnifolia Font. n. var 124

Fig. .5. Pen drawing of a portion of Fig. 4, natural size. Fig. 7. Pen drawing of a portion of Fig. 6, natural size.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XXXI

JURASSIC GINGKOS FROM OREGON.

PLATE XXXII.

Jurassic Flora of Oregon.

Page. Figs. 1, 2. Ginkgo Huttoni magnifolia Font. n. var 124

Fig. 2. Pen drawing of Fig. 1, natural size. Figs. 3-S. Ginkgo lepida Heer 125

Fig. 4. Pen drawing of Fig. 3, natural size.

Fig. 7. Enlargement of Fig. 6, X |.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XXXII

JURASSIC GINGKOS FROM OREGON.

PLATE XXXIII.

PLATEXXXIII.

Jurassic Flora of Oregon.

Page. Figs. 1-19. Ginkgo sibiriga Heer 125

Fig. 4. Enlargement of Fig. 3, X S. Fig. 6. Enlargement of Fig. 5, X f. Fig. 10. Enlargement of Fig. 9, X |. Fig. 13. Enlargement of Fig. 12, X 2. Fig. 1.5. Enlargement of Fig. 14, X 2. Fig. 17. Enlargement of Fig. 16, X 2. Fig. 19. Enlargement of Fig. IS, X 2.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XXXIII

JURASSIC GINGKOS FROM OREGON.

PLATE XXXIV.

Jurassic Flora of Oregon.

Pasre.

Figs. 1-12. Ginkgo sp. Font., aberrant forms of leaves 127

Fig. 2. Enlargement of Fig. 1 , X 2. Fig. 4. Enlargement of Fig. 3, X 2. Fig. 6. Enlargement of Fig. 5, X 2. Fig. 8. Enlargement of Fig. 7, X 2. Fig. 10. Enlargement of Fig. 9, X 2. Fig. 12. Enlargement of Fig. 11, X 2.

Figs. 13,14. Pikenicopsis ? sp. Font ' 128

Fig. 14. Pen drawing of Fig. 13, natural size.

■ Figs. 1.5-17. Taxites zamioides (Leek.) Sew ... 129

Fig. 1(3. Enlargement of Fig. 15.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XXXIV

JURASSIC GINGKOACE^E AND TAXACE/€ FROM OREGON.

PLATE XXXV.

Jurassic Flora of Oregon.

Page. Figs. 1-3. Taxite.s za.mioides (Leek.) Sew - - 129

Fig. 2. Enlargement of part of Fig. 1, X 3. Figs. 4-8. Brachvphyllum mamillare Brongn .-. 130

Fig. 5. Enlarged portion of Fig. 4, X 2.

Fig. 7. Enlargement of Fig. 6, X 2.

Fig. 9. .\kaucarites ? sp. Font, (cone scale) - - 131

FiG.s. 10-17. PiNL's NoRDENSKioLDi Hcer. - - - - 131

Fig. 11. Pen drawing of Fig. 10, natural size.

Fig. 13. Pen drawing of Fig. 12, natural size.

Fig. 1.5. Pen drawing of one of the leaves shown in Fig. 14, natural size.

Fig. 17. Pen drawing of Fig. 16, natural size.

U. S. QEOLOQIGAL SURVEY

MONOGRAPH XLVIII PL. XXXV

JURASSIC CONIFERS FROM OREGON.

PLATE XXXVI

PLATE XXXVI.

Jurassic Flora of Oregon.

Page. Figs. 1, 2. Cyclopitys oregonensis Font. n. sp 132

Fig. 2. Enlargement of Fig. 1, X S. Figs. 3-8. Sphenolepidium oregonense Font. n. sp _ 133

Fig. 4. Enlargement of Fig. 3, X 2.

Fig. 7. Enlargement of the principal branch shown in Fig. 6, X 2.

Fig. 8. Enlargement of the cone and twig to which attached sho%vn in Fig. 6, X 2. Figs. 9-12. Samaropsis ? oregonensis Font. n. sp , 134

Fig. 10. Enlargement of Fig. 9, X 3.

Fig. 12. Enlargement of Fig. 11, X 3. FiQ. 13. Male ament of conifer 135

U. S, GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XXXVI

JURASSIC CONIFERS FROM OREGON.

PLATE XXXVII.

Jurassic Flora of Oregon.

Page.

Figs. 1,2. Yuccites hettangensis Sap. ? 135

Fig. 2. Pen drawing of a portion of Fig. 1, natural size.

Figs. 3, 4. Undetermined leaf, No. 1 136

Fig. 4. Pen drawing of one of the leaves of Fig. 3, natural size.

Figs. 5, 6. Undetermined leaf, No. 2 136

Fig. 6. Pen drawing of a portion of Fig. .5, natural size.

Figs. 7, 8. Cakpolithus olallensis Ward n. sp 137

Fig. 9. Carpolithus Bucklandii Willn. ? 138

Figs. 10, 11. Carpolithus OREGONENeis Font. n. sp . 139

Fig. 12. Carpolithus elongatus Font. n. sp 139

Fig. 13. Carpolithus douglasensis Font. n. sp 139

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XXXVII

MISCELLANEOUS JURASSIC PLANTS FROM OREGON.

PLATE XXXVIII.

Jurasso-Cretaceous Floras.

Page. Figs. 1 , 2. Dicksoxia oregonensis Font. ? 148

Fig. 2. Enlargement of Fig. 1, X 2. Figs. 3, 4. Thyrsopteris Murrayak.4 (Brongn.) Heer ? 148

Fig. 4. Enlargement of Fig. 3. Figs. 5, 6. Cladophlebis vaccensis Ward 149

Fig. 6. Enlargement of Fig. 5, X 2. Figs. 7,8. Ctexis sulcicaulis (Phill.) Ward ? 149

Fig. 8. Enlargement of Fig. 7, X 3. Figs. 9, 10. Ctenopiiylluji ? sp. Font. n. sp. ? 149

Fig. 10. Enlargement of Fig. 9. Figs. 11, 12. Podozamites lanceolatus minor (Schenk) Heer ? ISO

Fig. 12. Enlargement of Fig. 11.

Figs. 13,14. Otozamites orego.mensis Font. n. sp 150

Figs. 1.5-18. Taxites zamioides (Leek.) Sew 151

Fig. 16. Enlargement of Fig. 15, X 2.

Fig. 18. Enlargement of Fig. 17, X 2. Figs. 19,20. Pterophyllum alaskense Font. n. sp 152

Fig. 20. Portion of Fig. 19, enlarged, X 2. Fig. 21. Sagenopteris alaskensis Font. n. sp - - 152

U. S. QEOLOQICAL SURVEV

MONOGRAPH XLVIII PL. XXXVIII

JURASSO-CRETACEOUS PLANTS FROM OREGON AND ALASKA.

PLATE XXXIX.

Jurasso-Cretaceous Flora of Cape Lisburne, Alaska.

Page. Figs. 1,2 Dicksonia Saportana Heer 15.5

Fig. 2. Enlarged portion of Fig. 1, X 3. Figs. 3-6 Onychiopsis psilotoides (Stokes & Welib) Ward n. comb 1.55

Fig. 4. Enlarged portion of Fig. 3, X 3.

Fig. 6. Enlarged pinnule of Fig. 5, X 3. Figs. 7, 8. Ci.adophlebis vaccensis Ward 157

Fig. 8. Enlarged portion of Fig. 7, X 3. Figs. 9-11. Cladophlebis alata Font 158

Fig. 10. Enlarged portion of Fig. 9. X 3.

Fig. 11. Two pinnules of Fig. 9, enlarged to .show the teeth, X 2.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XXXIX

JURASSO-CRETACEOUS FERNS FROM CAPE LISBURNE, ALASKA.

PLATE XL.

Jurasso-Cretaceous Flora of Cape Lisburne, Alaska.

Page. Figs. 1-9. Cladophlebis al.ata Font 158

Fig. 2. Enlarged portion of Fig. 1, X 2. Fig. 4. Enlarged portion of Fig. 3, X 2. Fig. 6. Enlarged portion of Fig. 5, X 3. Figs. 8, 9. Enlarged pinnules of Fig. 7, X 2.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XL

JURASSO-CRETACEOUS FERNS FROM CAPE LISBURNE, ALASKA.

PLATE XLI.

P L A T E X L I .

Jurasso-Cretaceous Flora of Cape Lisburne, Alaska.

Faee.

Ci,Aunpiii,EBi!S HuTTONi (Duiik.) Foiit. n. comb - - 161

Fig. 2. Portion of Fig. 1 enlarged, X i-

Fig. 3. Pinnule of Fig. 1 enlarged, X 2.

F'ig. -J. Pinnule of Fig. 1 enlarged and restored X -3.

Fig. Ft. Portion of Fig. 1 enlarged and restored Xi-

'-■.%'.•

J I B I

■ ' " * I i I I

.1 I • • I i ■

I B • I f 1

U. S. QEOLOQICAL SURVEY

MONOGRAPH XLVIII PL. XLI

JURASSO-CRETACEOUS FERNS FROM CAPE LISBURNE, ALASKA.

PLATE XLII.

PLATE X L T I .

,lui!Ass()-Ci!KrAci:()i's Floka of Capk IjISburnr, Alaska.

Hiiee.

Pkis. 1-3 Ci.AiiciiMii. Kills lli'iToNi ( 1 )unU. ) I' i"it ■ H- coiiili Kil

Kifl. 2. ICiiliirficd pinmilc of Kig. 1, X 2.

Fig. 3. Portion of Fig. 1 onliiiged and restoied, X 3.

U. S. GEOLOGICAL SURVE

MONOGRAPH XLVIII PL. XLII

JURASSO-CRETACEOUS FERNS FROM CAPE LISBURNE, ALASKA.

PLATE XLIII.

Jurasso-Cretaceous Flora of Cape Lisburne, Alaska.

Pape.

Fios. 1-7. Ci..4DOPHLBBis HuTTONi (Dunk.) Font. a. comb 161

Fig. 2. Portion of Fig. 1 enlarged, X 2.

Fig. 3. Pinnule of Fig. 1 restored and slightly enlarged.

Fig. 5. Enlarged pinnule of Fig. 4, X 2.

Fig. 6. Pinnule of F^ig. 4 restored and slightly enlarged.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XLIII

JURASSO-CRETACEOUS FERNS FROM CAPE LISBURNE, ALASKA.

PLATE XLIY

PLATE XLIV.

Jurasso-Cretaceous Flora of Cape Lisburne, Alaska.

Page.

Fig. 1. PoDozAMiTEs GRANDiFOi.ius Font. ? 167

Fig. 2. Baiera gracilis (Bean) Bunb. 168

Figs. 3, 4. Ginkgodium ? alaskense Font. n. sp 168

Fig. 4. Outline sketch of Fig. 3 showing tlie plan of neivation, natural size.

Figs. 5, 6. Ginkgo digitata (Brongn.) Heer 170

Figs. 7, 8. Ginkgo Huttoni magnifolia Font. 'L 170

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XLIV

JURASSO-CRETACEOUS CYCADS AND GINGKOACE/E FROM GAPE LISBURNE, ALASKA.

PLATE XLV.

Jurasso-Cretaceous- Flora of Alaska, Montana, anu California.

Page.

Figs. 1-5. Nageiop.sis i.ongifoi.i.\ Font. ? from the Jurasso-Cretaceous of Cape Lisbunie,.\laska 171

Fig. 4. Enlarged portion of Fig 3, X 3.

Fig. 6. BKACUYPiiyLLUM ? Storrsii AVard n. sp 176

Figs. 7,8. Sequoia Reichenbachi (Gein.) Heer from the Jurassic or Lower Cretaceous of Mon- tana - - - 177

Fig. 8. Enlarged portion of Fig. 7. Figs. 9-11. Sequoia Fairbanksi Font. n. sp. from the Juras.so-Cretaceous of Slate Spring-'^, Cali- fornia - - - — 178

U. S. QEOLOQICAL SURVEY

MONOGRAPH XLVIII PL. XLV

JURASSO-CRETACEOUS CONIFERS FROM ALASKA, MONTANA, AND CALIFORNIA.

PLATE XL VI.

PLATE XLVI.

JcRASsic Cycads from THE Freezeout Hills, Wyoming.

Page. CycADELLA WYOMiNGENSis Ward 183

View of one side and part of the base of the trunk consisting of Nos. 500.88, 500.513, and 500.525 of tlie museum of the University of Wyoming.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XLVI

JURASSIC CYCADS FROM WYOMING.

PLATE XLVII.

PLATE XL VII.

Jurassic Ctcads from the Freezeout Hills, Wyoming.

Page.

Figs. 1, 2. Cycadell.\ Knowltoniana Ward 1S5

Side views of the fragments Nos. .500.9-1 and 500.498, respectively, of the museum of the Univei-sity of Wyoming.

Fig. 3. Cycadella Reedii Ward 182

Side view of the small trunk No. 100.239 of the museum of the University of Wyoming.

Fig. 4. Cycadella compressa Ward 186

Side and top view of the small trunk No. 100.264 of the museum of the University of Wyoming.

PLM^E XLVIIL

PLATE XLVIII.

Jurassic Cycads from the Freezeout Hills, Wyoming.

Page.

Cycadella compressa Ward 1S6

Fig. 1. Side and top view of the small trunk No. .500.503 of the museum of the University of

Wyoming. Fig. 2. Side view of the small trunk No. 100.22S of the museum of the Univereity of Wj-oniing.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XLVIII

CENTIMETERS I

JURASSIC CYCADS FROM WYOMING.

PLATE XLIX.

JlTRASSIC CyCADS FROM THE FrEEZEOUT HiLLS, WyOMIXG.

Page.

Cycadella JIRASSICA Ward _. 1S6

View of the surface of the segment resulting from the union of the fragments Nos. 100.2(M and 500.507 of the museum of the Unirersity of Wyoming.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XLIX

JURASSIC CYCADS FROM WYOMING.

PLATE L.

Jurassic Cycads from the Feeezeout Hills, Wyoming.

Pago

Cycadella nodosa Ward 187

Side view of the trunk No. 500.509 of the museum of the University of Wyoming.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. L

i..^'> -^^

A^.

/^'^^ I

AJ'

CENTIMETERSI

JURASSIC CYCADS FROM WYOMING.

PLATE LL

PLATE LI. Jurassic Cycads from the Freezeout Hills, Wyoming.

Page. Cycadella nodosa Ward - - 18"

Side \-ipw showing also part of the base of the trunk No. lOU.L'Ob of the museum of tlie University of Wyoming.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LI

CENTIMETERS I

JURASSIC CYCADS FROM WYOMING.

PLATE LII.

P L A T E L 1 1 . Jurassic Cycads from the Freezeout Hills, Wyoming.

Page. Flo. 1 . Ctcadella nodosa Ward. 187

Side view of the small trunk No. 100.229 of the museum of the University of Wyoming. Fius. 2-4. Cycadella cirrata Ward.. 188

Fig. 2. Side view of the triangular section resulting from joining Nos. .500.178 and .500.422

of the museum of the University of Wyoming. Figs. 3, 4. Views of the internal structure shown in the fractures of Nos. 500.422 and

500.136, respectively, of the museum of the University of Wyoming.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. Lll

JURASSIC CYCAD8 FROM WYOMING.

PLATE LIII.

Jurassic Cycads from the Freezeout Hills, Wyoming.

Page. CvcADELLA ciRRATA Ward _ ] S8

View of the internal structure shown in the tangential fracture of the fragment No. 100.245 of the museum of the University of Wyoming.

PLATE LIT.

PLATE LIV. Jurassic Cycads from the Freezeout Hills, Wyoming.

Page. Cycadella exogena Ward 1S9

Fh;. 1. View of the tangential fracture of the trunk No. .500..514 of the museum of the University of Wyoming.

Figs. 2, 3. Views of the radial fractures of the two fragments Nos. .500.41(3 and .500.174, respec- tively, of the museum of the Univei-sity of Wyoming, showing the cxogenou.s struc- ture and woodv wedges.

PLATE LV.

Jurassic Cycads from the Freezeout Hills, Wyoming.

Page. Cycadella ramentosa Ward - 191

Fig. 1. Side view of the trunli No. 100.214 of the museum of the University of Wyoming. Fig. 2. 'S'iew of the rough radial fracture of the fragment No. 100.201 of the museum of tlie Uni- vei'sitv of Wvoming.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIll PL. LV

JURASSIC CYCADS FROM WYOMING.

PLATE LVI.

PLATE L V I .

Jurassic Cycads from the Freezeout Hills, Wyoming.

Page. Cycadella contracta \Tard. 192

Fig. 1. Side view of the imperfect trunk No. 100.218 of tlie museum of the University of

W\'omii)g. Figs. 2, 3. Views of the outer and inner surfaces, respectively, of tlie small trunk Nu. 1(X1.241 of

the museum of tlie University of Wyoming.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LVI

I CENTIMETERS I

JURASSIC CYCADS FROM WYOMING.

PLATE LTII.

PLATE LVII.

Jurassic Cycads from the Freezeout Hills, Wyoming.

CiCADELLA JEJUNA Ward - 194

Side view of the trunk consisting of Nos. .500.5L5 and 500.491 of the museum of the Universitj' of Wyoming.

PLATE LVIII.

Jurassic Cycads from the Freezeout Hills, Wyoming.

Page. Cycadella CREPiDAEiA Ward - 195

View of the best presei-ved side of die tiunl:, consisting of Nos. 100.202, 100.215 and 100.230 of the museum of the University of Wyoming.

U. S. GEOLOQIOAL SURVEY

Monograph xlvim pl. lviI

JURASSIC CYCADS FROM WYOMING.

PLATE LIX.

PLATE LIX. Jurassic Cycads from the Freezeout Hills, Wyoming.

Page. Cycadeli.a crepidaria Ward - - 195

\'ie\v tif one side of tlie trunk No. 100.203 of the jiuiseum of the Univei-sity of Wyoming.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LIX

JURASSIC CYCADS FROM WYOMING.

PLATE LX.

Jurassic Cycads from the Freezeout Hills, Wyoming.

Page. Cycadei.i.a crepidaria Ward 195

View of the convex side of tlie trunk Xo. 100.226 of the museum of tlie University of Wyoming

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LX

JURASSIC CYCADS FROM WYOMING.

PLATE LXI.

Jurassic Cycads from the Freezeout Hills, Wyoming.

Page Cycadei.la Knightii Ward 197

View of the convex side of the trunk No. 500.6S7 of the museum of the University of Wyoming.

U. S. GEOLOGICAL SURVE

MONOGRAPH XLVIII PL. LXI

JURASSIC CYCADS FROM WYOMING.

PLATE LXII.

Jurassic Oycads from the Freezeout Hills, Wyoming.

Page. Figs. 1-3. Cycadella ramentosa Ward 191,200,201,202,203

Fig. 1. Hypothetical form of irond.

Fig. 2. Transverse section of young frond, X 25.

Fig. 3. Transvei-se section of ramental eliafl', X 6.5. Fig. 4. Wii.i.iamsonia gigas (L. & H.) Carr. (introduced for comparison). . 201,204

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LXII

JURASSIC CYCADS FROM WYOMING.

PLATE LXIII.

Jurassic Cycads from Wyoming.

Page.

Fig. 1. Cycadella kamentosa Ward 200, 201 , 202

Trans veree section of young frond, X 25. Fig. 2. Cycadella utopiensis Ward. 204

U. S. GEOLOGICAL SU«VEY

MONOGRAPH XLVIII PL. LXIII

JURASSIC CYCADS FROM WYOMING.

PLATE LXIV.

Page. Sketch map of the Shasta foruiatiou of CaUfomia yieldiug fossil plauts - 221

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVin PL. LXIV

SKETCH MAP SHOWING- FOSSIL LOCALITIES OF THE SHASTA FORMATION

NORTHERN CALIFORNIA Scale

PLATE LXT.

PLATE LXV.

Flora of the Shasta Formation.

Page.

FlC. 1 . DiCKSONIA PACIIVPHYLLA Foilt. 11. sp 224

Figs. 2-4. Thvrsopteris rarinervis Font, t 22.5

Figs. .5-8. Cladophlebis parva Font •. 1 22.5

Figs. 9-11. Cladophlebis Browniana (Dunk. ) Sew _ 226

Figs. 12-14. Cladophlebis falcata Font 227

Figs. 15, 16. Cladophlebis Ungeri (Dunk. ) Ward n. comb 228

Figs. 17-21. Cladophlebis alata Font. '. . 229

Figs. 22,23. Matonidium Althausii (Dunk.) Ward 230

Figs. 24-29. Gleichenia Nokdenskioldi Heer 231

Figs. .30-3.5. Sagenopteris Mantelli (Dunk.) Schenk 233

Figs. 36-38. Sagenopteris orbgonbnsis Font. n. roiub 23.5

Figs. 39, 40. Sagenopteris elliptica Font 236

Figs. 41-45. S.-vgenopteris nervosa Font, n.sp 237

Fig. 4G. Sagenopteris ? sp. Font 238

Flu. 47. IIausmannia '( californica Font, n.sp - 23S

U. S. QEOLOQIOAL SURVEY

MONOGRAPH XLVIII PL. LXV

FERNS FROM THE SHASTA FORMATION OF CALIFORNIA AND OREGON.

PLATE LXVI.

PLATE LXVI. Flora of the Shasta Formation.

Page.

Figs. 1-4. Angiopteridium canmorense Dn. ?.. -. 239

Figs. 5-7. Angiopteridium strictinerve Font 240

Figs. 8-10. Angiopteridium strictinerve latifolium Font 241

Fig. 11. Gleichenia ? Gii.bert-Thompsoni Font. n. sp 232

Figs. 12, 13. Ctenopteris integrifolia Font - 242

Fig. 13. Enlargement of Fig. 12.

Fig. 14. Eqdisetum texense Font. ?. - 243

Fig. 15. Dioonites Dunkerianus (Gopp.) Miq .-. - - 243

Figs. 16, 17. Dioonites Buchianus (Ett.) Born - - 244

U. S. QEOLOQICAL SURVEY

MONOGRAPH XLVIII PL. LXVI

FERNS FROM THE SHASTA FORMATION OF CALIFORNIA AND OREGON.

PLATE LXVII.

Flora of the Shasta Formation.

Page.

Figs. 1-3. Dioonites Buchianus abietinus (Gijpp. ) Ward n. comb 250

Fig. 4. Dioonites Buchianus rarinervis Font. ? 251

Figs. 5, 6. Nii.sonia Stantoni Ward n. sp 251

Fig. 7. Nilsonia californica Font -. 252

Fig. 8. Nilsonia sambucensis Ward n. sp 254

Fig. 9. Pterophyllum ? lowryanum Ward n. sp 254

Fig. 10. Ctenophyllom latifolium Font. ? 255

U. S. GEOLOGICAL SURVEY

MONOGPAPH XLVIII PL. LXVII

CYCADS FROM THE SHASTA FORMATION OF CALIFORNIA AND OREGON.

PLATE LXVIII.

Flora of the Shasta Formation.

Page.

Fig. 1 . Zamites arcticus Gopp 256

Figs. 2,3. Zamites tenuinervis Font 257

Fig. 4. Cycadeospermum californicum Font. n. sp 257

Figs. 5-7. Cephalotaxopsis ramosa Font. ? 258

Fig. 8. Cephalotaxopsis rhttidodes ? Ward n. sp 258

Figs. 9-12. Nageiopsis longifolia Font. ?. 259

Fig. 13. Nageiopsis latifolia Font. ? 260

Fig. 14. Abietites ellipticus Font 260

Figs. 15, 16. Abietites macrocarpus Font - 261

Fig. 17. Abietites * sp. Font, (immature cone) 262

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LXVIll

CYCADS AND CONIFERS FROM THE SHASTA FORMATION OF CALIFORNIA AND OREGON.

PLATE LXIX.

Flora of the Shasta Formation.

Page.

Figs. 1-3. Pinus shastbnsis Font. n. sp 262

Figs. 4, S. Sequoia Reichenbachi (Gein. ) Heer 263

Fig. 6. Sequoia ambigua Heer 264

Fig. 7. Sphenolepidium Sternbergianum (Dunk. ) Heer 264

Fig. S. Saliciphyllum pachyphyllum Font. n. sp. 265

Fig. 9. Saliciphyllum californicum Font. n. sp 266

Fig. 10. POPULUS ? RiCEi Font. n. sp 266

Fig. 11. Prote^phyllum californicum Font. n. sp 267

Figs. 12-14. Menispermites californicus Font. n. sp 268

Figs. 15-17. Sapindopsis oregonensis Font. n. sp 26S

Fig. 18. AcAciiEPHYLLUM ELLiPTicuM Font. n. sp 269

Fig. 19. Acaci.!ephyllum pachyphyllum Font. n. sp 270

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LXIX

r

i

CONIFERS AND DICOTYLEDONS FROM THE SHASTA FORMATION OF CALIFORNIA AND OREGON.

PLATE LXX.

Flora of the Shasta Formation.

Vase. Cycadeoidea Stantoni Ward n. sp 276

View of the best preserved side.

PLATE LXXI

PLATE LXXI.

Flora of the Kootanie Formation.

Page Figs. 1—4. Dicksonia montanensis Font. n. sp 286

Fig. 2. Enlarged pinnule of Fig. 1, X 2.

Fig. 4. Enlarged pinnule of Fig. 3, X 2. Figs. 5-11. Dicksonia pachyphylla Font 288

Fig. 6. Portion of Fig. 5 enlarged, X 4.

Fig. 8. Enlargement of Fig. 7, X 2.

Fig. 10. Portion of Fig. 9 enlarged, X 3.

Figs. 12, 13. Thyrsopteris elliptica Font .~. 290

Figs. 14-20. Cladophlebis falcata montanensis Font. n. comb 291

Fig. 16. Portion of Fig. 15 enlarged, X 2.

Fig. 18. Pinnule of Fig. 17 enlarged, X 2. Figs. 21-25. Cladophlebis iieterophylla Font 294

Fig. 22. Pinnules of Fig. 21 enlarged, X 2. Fig. 26. Cladophlebis constricta Font. ? 297

U. S. GEOLoaiCAL SURVEY

MONOGRAPH XLVIII PL. LXXI

FERNS FROM THE KOOTANIE FORMATION OF MONTANA.

PLATE LXXII.

Flora of the Kootanie Formation.

Page. Fi(;s. 1-11. Eqcisetlm Phillipsii (DunU. ) Brongn. 29S

Fig. 9. Portion of Fig. S enlarged, X 2.

Fig. 10. Portion of Fig. S enlarged, X 3 and restored. Figs. 12-14. Equisetum Lvellii Mant 301

Fig. 1-4. Portion of Fig. 13 enlarged, X 3 and restored. Fi(;s. 1.5. 16. Lycopodites ? .mont.\nensis Font. n.sp,. Z02

Fig. IG. Portion of Fig. 1.5 enlarged, X 2. Fios. 17-21, NiLSONiA ScHAUMBURGENSis (Dunk.) Natli 303

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LXXll

/>,x

EQUISETA AND CYCADS FROM THE KOOTANIE FORMATION OF MONTANA.

PLATE LXXIII.

Flora of the Kootanie Formation.

Page

Figs. 1-6. Za.mites arcticus Gopp SOU

Fig. 6. Portion of Fig. 5 enlarged, X 4.

Fig. 7. Cycadeospermum montanense Font. n. sp 310

Fig. 8. Cephalotaxopsis eamosa Font. ? 31 1

Fig. 9. Nageiopsis i.ongifolia Font 311

Fig. 10. Nageiopsis montanensis Font. n. sp 312

Figs. 11-14. Laricopsis longifolia l.atifolia Font. n. var 312

Flora of the Lakota Formation.

Fic!. 15. (a-c). NiLsoNiA nigracollen'sis Wielaiid n. sp 319

Fig 1.5d. Thyrsopteris dentifolia Font 320

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LXXIII

CYCADS AND CONIFERS FROM THE KOOTANIE FORMATION OF MONTANA AND THE LAKOTA FORMATION OF SOUTH DAKOTA.

PLATE LXXIV.

Page. View of exposure on Ontario avenue, in rear of Lanier Heights, Washington, D. C, looking north, show- ing the Rappahannock sands of the Potomac formation resting on the crystalline rocks. From a photograph hy the United States Geological Survey, 1S92 3S2

PLATE LXXV

PLATE LXXV.

Page. Exposure ou Kansas avenue, between the Adams Mill road and Ontario avenue, Washington, D. C, looking east, showing the Potomac formation overlain by the Columbia bowlder clay. From a pho- tograph by the United States Geological Survey, 1892 382

PLATE LXXVI.

Page. Exposure on Sixteentli street, opposite Crescent street, Washington, D C, looking northeast, showing

hasiil lA)loiniU' c-l;iys overlain hy superficial deposits (compare section on page 386) — - 382

PLATE LXXVII.

PLATE LXX VII.

Page. Exposures at Terra Cotta,D. C.,in the railroad cutting looking ea-st, showing irrfgularly hedded Rappa- hannock sands inclosing clay lenses. The two views overlap nearly half their width and repi-esent about 100 feet from noi-th to south, Fig. 1 being the more northerly 383

U. S. QEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LXXVII

EXPOSURES OF THE POTOMAC FORMATION AT TERRA COTTA, D. C.

PLATE LXXVIII.

Page

Exposures at Freestone, Va., in railroad cutting, looking west 385

Fig. 1. North end of cut, showing Rappahannock sand with a stratum of green clay and below it

on the right a lens of the same. Fig. 2. South end of cut, Rappahannock sand with large lens of green clay near the top, running out on the left.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LXXVIII

EXPOSURES OF THE POTOMAC FORMATION AT FREESTONE, VA.

.#

PLATE LXXTX.

PLATE LXXIX.

Page.

Exposures on Back Lick Run 5 miles southwest of Alexandria, Va., looking east 386

Fig. 1. Cross-bedded Rappahannock sands with lenses of green clay. Fig. 2. Pure white lenticularly bedded Rappahannock sands.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LXXIX

. ^^y^	^•^
■MfP ^ jjl^iil^te^ tI	^^B^SHflftK' iJtiirffjtflffniBfllii
Mi

EXPOSURES OF THE POTOMAC FORMATION ON BACK LICK RUN, VIRGINIA.

PLATE LXXX.

Page. Map showing the distribution of the formations of tlie Potomac group in Maryland, the District of Cokimbia, and adjacent parts of Virginia, with indication, by numbers, of the localities at which fossils and other objects mentioned in the text have been found 412

PLATE LXXXI.

Maryland Potomac Cycads.

Page. Ctcadeoidea maeylandica (Font.) Cap. & Solms. Side and base view of the Johns Hopkins Univer- sity Cycad, No. 1 : al.so of siUcified wood from the Potomac formation of Maryland, from a photo- graph by Tyson 41 9

(For historical account, see p. 410.)

PLATE LXXXII.

Maryland Potomac Cycads.

Page Cycadeoidea marylandica (Font.) Cap. & Solms. View of Johns Hopkins Univei'sity Oycad, No. 2.

from a photograph b}' Tyson. 421

(For historical account, see p. 410.)

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LXXXII

TRUNK OF CYCAD EARLY DISCOVERED IN THE POTOMAC FORMATION OF MARYLAND.

PLATE LXXXIII.

Maryland Potomac Ctcads.

Page. Figs. 1-3. Group of cycads, from a photograph by Tyson (for historical account, see p. 414). Figs. 1,2. Cycadeoidea marylandica (Font.) Cap. & Solms.

Fig. 1 . Side and top view of Johns Hopkins University Cycad, No. 1 . 422

Fig. 2. Side view of Johns Hopkins University Cycad, No. 3 422

Fig. 3. Cycadeoidea Bibbinsi Ward, Johns Hopkins University Cycad, No. 4 458

Fig. 4. Cycadeoidea marylandica (Font.) Cap. & Solms.

View of the base of the Link trunk, No. 1481, of the museum of the Woman's College of

Baltimore 422

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LXXXIII

' '^i*^V'^^'^^fe^ *:?'«se'

I I I I I I I I I I CENTIMETERS I

I DECIMETERSI

TRUNKS OF CYCADS EARLY DISCOVERED IN THE POTOMAC FORMATION OF MARYLAND.

PLATE LXXXIT.

PLATE LXXXIV.

Maryland Potomac Cycads.

Group ot cycads in tlie museum of tlie Johns Hopkins Univereity, Baltimore.

Figs. 1,2. Cycadeoidea mahylandica (Font.) Cap. & Solms. Page.

Fig. 1. Side view of Johns Hopkins University Cycad, No. ."i 422

Fig. 2. Johns Hopkins University Cycad, No. 3 423

Fig. 3. Cycadeoidea Bibbinsi Ward, Johns Hopkins Univei-sity Cycad, No. 4 458

.1 i

PLATE LXXXV.

Maryland Potomac Cycads.

C'ycadeoidea Bibbinsi Ward. Page.

View of tlie external surface of the fragment sent by Philip Tvson to Sir William Dawson, known

as the Dawson Cvcad . - - - 459

(For historical account see p. 409.) •

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. LXXXV

TRUNK OF CYCAD EARLY DISCOVERED IN THE POTOMAC FORMATION OF MARYLAND.

PLATE LXXXVI.

Maryland Potomac Cycaus. Cycadeoidea Fontaineana Ward. Page,

View of the external surface of the South Carohna College Cycad 442

(For historical account see p. 411.)

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIM PL. LXXXVI

TRUNK OF CYCAD EARLY DISCOVERED IN THE POTOMAC FORMATION OF MARYLAND.

PLATE LXXXVII

PLATE LXXXVII.

Maryland Potomac Cycads.

Group of Cycads in the Museum of the Woman's College of Baltimore.

Page.

Fig. 1, 1. The Turner trunk: No. 3046, Cycadeoidea Fontaineana Ward 443

Fig. I, 2. The Tubbs trunk : No. 1 465, Cycadeoidea Blbeinsi Ward 460

Fig. 1, 3. The Wilson trunk ; No. 1479, Cycadeoidea Gouciieriana Ward 452

Fig. i, 4. The Pollv Jones trunk; No. 1427, Cycadeoidea Bibbinsi Ward 460

Fig. I, 5. The R. f. Donaldson trunk. No. 1 ; No. 1472, Cycadeoidea Tysoniana Ward 433

Fig. 1, 6. The Weston trunk; No. 1468, Cycadeoidea Bibbin.si Ward 460

Fig. 1, 7. The Dennis Butler trunk ; No. 1462, Cycadeoidea Bibbinsi Ward 460

Fig. II, 1 ■ The Robinson trunk ; No. 1487, Cycadeoidea Bibbinsi Ward 460

Fig. II, 2. The Lintliicuni fragment ; No. 1484, Cycadeoidea Bibbinsi Ward 461

Fig. 11^3- The Link trunk; No. 1481, Cycadeoidea marylandica (Font.) Cap. & Solnis 423

Fig. ii! 4. The Doisev trunk: No. 6353, Cycadeoidea Bibbinsi Ward 461

Fig. II, 5. The Reinsiiyder trunk; No. 6344, Cycadeoidea marylandica (Font.) Cap. & Solnis 424

Fig. ii!6. The Hehvig trunk; No. 3328, Cycadeoidea m-^rylandica (Font.) Cap. & Solms 424

Fig! II, 7. The R. T. Donaldson fragment. No. 3 ; No. 3324, Cycadeoidea marylandica (Font. ) C. & S . 424

Fig. u, 8. The All-Saints tmnk; No. 1466, Cycadeoidea Bibbinsi Ward 456

Fig. ii! 9. The Gray trunk; No. 6354, Cycadeoidea Bibbinsi Ward 462

Fig. ii, 10. The Smith ti-unk; No. 1482, Cycadeoidea Bibbinsi Ward 462

Fig. n, 11. The Smith fragment ; No. 1483, Cycadeoidea Bibbinsi Ward 462

Fig. Ill, 1. The Lester trunk; No. 3056, Cycadeoidea m.^rylandica (Font.) Cap. & Solms 424

Fig. mi 2. The Griffith tmnk; No. 1467, Cycadeoidea Fontaineana Ward 443

Fig. in, 3. The Clark trunk; Nos. 16.59, 1659a, Cycadeoidea McGeeana Ward 435

Fig. Ill, 4. The Crook fragment; No. 1428, Cycadeoidea marylandica (Font.) Cap. & Solms 425

Fig. \u, 5. The Can- trunk ; No. 1463, Cycadeoidea Bibbinsi Ward 463

Fig. Ill, 6. The Noah Donaldson trunk; No. 1470, Cycadeoidea Fontaineana Ward 443

Fig. Ill, 7. The Welsh trunk; No. 1464, Cycadeoidea Bibbinsi Ward 464

Fig. mi 8. The Riddle fi-agment; No. 1488, Cycadeoidea Fontaineana Ward 443

Fig. m, 9. The Hegeman trunk; No 6345, Cycadeoidea Fisiier.^;: Ward, n. sp 471

Fig. in, 10. The M. A. Donaldson trunk; No. 1471, Cycadeoidea McGeeana Ward 435

Fig. IV, 1. The Comegys fragment; No. 1658, Cycadeoidea Fontaineana Ward 444

Fig. ivi 2. The Harman trunk; No. 1426, Cycadeoidea Bibbinsi Ward 464

Fig. IV, 3. The R. P. Disney fragment. No. 1 ; No. 3348, Cycadeoidea Bibbinsi Ward 464

Fig. IV, 4. The R. P. Disney trunk, No. 1; No. 6343, Cycadeoidea marylandica (Font.) C. & S 425

Fig. ivi 5. The Harwood trunk; No. 3050, Cycadeoidea marylandica (Font.) Cap. & Solnis 425

Fig. IV, 6. The Ring fragment ; No. 1480, Cycadeoidea Bibbinsi Ward 465

Fig. IV, 7. Tlie K. P. Disney trunk, No. 2; No. 6352, Cycadeoidea Fontaineana Ward 444

Fig. IV, 8. The Snowdon fragment ; No. 3054, Cycadeoidea Bibbinsi W^ard 465

Fig. IV, 9. The R. P. Disney fragment. No. 2; No. 6348, Cycadeoidea Fontaineana Ward 444

Fig. IV, 10. The Crook fragment. No. 2: No. 1429, Cycadeoidea IT,ileri Ward 454

Fig. IV, 11. The Travers fragment; No. 1478, Cycadeoidea Bibbinsi Ward 466

Fig. IV, 12. The R.T.Donaldson fragment. No. 6; No. 3341, Cycadeoidea marylandica (Font.)C.&S. . 426

Fig. IV, 13. The Tubbs fragment; No. 1192, Cycadeoidea marylandica (Font. ) Cap. & Solms 427

Fig. IV, 14. The Morgan trunk; No. 3051, Cycadeoidea marylandica (Font.) Cap. & Solms 427

Fig. iy, 15. The Inglehart fragment. No. 1 ; No. 3325, Cycadeoidea McGeeana Ward 436

Fig. V, 1. The Cole fragment- No. 3122, Cycadeoidea Fontaineana Ward 444

Fig. v,2. The Harrison fragment ; No. 1486, Cycadeoidea marylandica (Font. ) Cap. & Solms 427

Fig. v,3. TheR.T.Donaldsonfragment,No.2; No. 1656,Cycadeoidea marylandica (Font.)C.&S. . 428

Fig. V, 4. The Giles fragment; No. 3352, Cycadeoidea Tysoniana Ward 433

Fig. V, 5. The Owens fragment; No. 3057, Cycadeoidea marylandica (Font.) Cap. & Solms 428

Fig. v',6. The R.P.Disney fragment, No. 3; No. 6350. Cycadeoidea marylandica (Font.) C.&S 428

Fig. v,7. TheR.T.Donaldsonfragment,No.7; No. 6349, Cycadeoidea marylandica (Font.)C.(kS. . 428

Fig. V, 8. The Deakins fragment ; "No. 3055, Cycadeoidea McGeeana Ward 436

Fig. V, 9. The, Luther Welsh fragment; No. 3323, Cycadeoidea McGeeana Ward 436

Fig. V, 10. The Inglehart fragment; No. 6347, Cycadeoidea Fontaineana Ward 444

Fig. V, 11. The Magi-uder fragment; No. 1489, Cycadeoidea Fontaineana Ward 445

Fig. V, 12. The R. P. Disney fragment; No. 6351, Cycadeoidea Bibbinsi Ward 466

Fig. V, 13. The Emmons fragment ; No. 3346, Cycadeoidea Fontaineana Ward 445

Fig. V, 14. The Odensoss fragment ; No. 3347, Cycadeoidea Fontaineana Ward 445

Fig. v,15. The Sinmis fragment; No. 3047, Cycadeoidea Bibbinsi Ward 466

Fig. V, 16. The AndoTson fragment; No. 6346, Cycadeoidea Fontaineana Ward 445

Fig. V, 17. The D. O. Donaldson fragment; No. 1657. Cycadeoidea marylandica (Font.) C. & S .. . 429

Fig. V, 18. The R. T. Donaldson fragment. No. 4; No. 3326, Cycadeoidea Fontaineana Ward 445

Fio. V, 19. The W. P. Disnev fragment; No. ,3349, Cycadeoidea McGeeana Ward 437

Fig. V, 20. The White fragment; No. 3068, Cycadeoidea McGeeana Ward 437

Fig. v,21. The R. T. Dimaldson fragment, No. 1; No. 1473, Cy.\cdeoidea Fontaineana Ward 445

PLATE LXXXVIII.

Marit^and Potomac Cycads.

Cycadeoiuea MARYLANDICA (Font. ) Cap. & Solms. Pago.

View of the Link trunk, No. 1481, of the museum of tlie Woman'.s College of Baltimore, restored to its place in the Link Gulch, near Arbutus, Maiyland, also showing the exposure as seen from the west side, looking across the gulch 429

PLATE LXXXIX.

Fio. I	1
Fia. I	2.
Fig. I	3.
Fig. 1	4.
Fig. I	5.
Fig. m	1.
Fig. II	2.
Fig. II	3.
Fig. II	4.
Fig. II	•5.
Fig. II	6
Fig. u	7.
Fig. 11	8.
Fig. Ill	1
Fig. Ill	2
Fig. Ill	3.
Fig. Ill	4.
Fig. Ill	■5
Fl.i. HI	(i
Fig. Ill	7
Fig. Ill	fS
Fig. Ill	9
Fig. hi	10
Fig. hi	11

PLATE LXXXIX.

Maryland Potomac Cycads.

Guoui' OF Cycads in the museum oe the Woman's College oe Baltimore.

IMgc.

The Whitehead ti'iink, No. 2; No. 90.51, Cycadeoidea Fontaineana Ward 44(i

The Whitehead trunk, No. 1; No. EOSO, Cycadeoidea Clarkiana Ward n. sp 473

The Dearstine trunk; No. 9049, Cycadeoidea Gouchekiana Ward 452

The R. T. Donaldson trunk, No. 2; No. 90.52, Cycadeoidea Clarkiana Ward n. sp 473

The Travels trunk; No. 6356, Cycadeoidea Bibbinsi Ward 467

The R. T. Donaldson fragment, No. 9; No. 9047, Cycadeoidea McGeeana Ward 437

The Marlowe fragment. No. 2; No. 9059, Cycadeoidea Bibbinsi Ward 467

The Allen fragment, No. 1; No. 9046, Cycadeoidea marylandica (Pont.) Cap. & Solnis.. 429

The R.T. Donaldson fragment, No. 14; No. 9058, Cycadeoidea marylandica (Font.) Cap.

& Solms - - 430

The David Ring trunk; No. 63.57, Cycadeoidea Bibbinsi Ward 468

The Allen fragment, No. 2; No. 9048, Cycadeoidea Bibbinsi Ward 468

The R. P. Disney fragment, No. 6; No. 6359, Cycadeoidea marylandica (Font.) Cap. &

Solms - 430

The R. T. Donaldson fragment, No. 13; No. 9057, Cycadeoidea McGeeana Ward 437

The R. T. Donaldson fragment. No. 10; No. 9053, Cycadeoidea Fontaineana Ward 446

The R. P. Disney fragment, No. 5; No. 6358, Cycadeoidea marylandica (Font.) Cap. &

Solms - 430

The Marlowe fragment. No. 3; No. 9061, Cycadeoidea Fontaineana Ward 446

The Travers fragment. No. 2; No. 9060, Cycadeoidea McGeeana Ward. 438

The R.T. Donaldson fragment. No. 17; No. 9065, Cycadeoidea marylandica (Font.) Cap.

& Solms 430

The R. T. Donaldson fragment. No. 15; No. 9062, Cycadeoidea Fontaineana Ward... 446

The R. T. Donaldson fragment, No. 16; No. 9064, Cycadeoidea Fontaineana Ward 446

The R. T. Donaldson fragment, No. 8; No. 8319, Cycadeoidea marylandica (Font.) Cap.

& Solms :- 430

The Marlowe fragment , No. 1 ; No. 9055, Cycadeoidea McGeeana Ward 438

The R. T. Donaldson fragment, No. 11; Nb. 9054, Cycadeoidea McGeeana Ward 438

The R. T. Donaldson fragment, No. 12; No. 9056, Cycadeoidea Fontaineana Ward . .. 447

PLATE XC.

Maryland Potomac Cycads.

Pago. Thp Link trunk, Cvcadeoidea marylandica (Font.) Cap. & Solnis, No. 1481 of the museum of the

Woman's College oC Baltimore - 431

PLATE XCL

PLATE XGI.

Maryland Potomac Cycads.

Page. The Helwig tnaiik, Cycadeoidea maryi,andica (Font.) Cap. & Solms, No. 3328 of the niusnini of llie

Woman's College of Baltimore _ . _ 431

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XCI

CENTIMETERS I

CYCADEOIDEA MARYLANDICA.

PLATE XCII.

Maryland Potomac Cycads.

Page. Trunk, No. 1 . of the museum of the Maryland Academy of Sciences, Cycadeoidea maeylandica (Font.)

Cap. & Sohiis. Two views of opposite sides — 432

PLATE XCin.

PLATE XCIII.

Maryland Potomac Cycads.

Page. The R. T. Donaldson trunk, No. 1, Cycadeoidea Ttsoniana Ward, No. 1472, of tlie Woman's College

of Baltimore _ _ _ _ 433

. GEOLOGICAL SURVEY

CYCADEOIDEA TYSONIANA.

PLATE XCIV.

Maryland Potomac Cycads.

CrcADEOiDEA McGeeana Ward. Page.

The Clark trunk, otherwise known as the "insect nest," consisting of Nos. 1659 and 1659a of the

museum of the Woman's College of Baltimore 438

PLATE XCV.

Maryland Potomac Cycads.

OyCADEOlDEA FoNTAINEANA Ward. Page

View of the top of the Turner trunk or "Chicken trough," No. 3046 of the museum of the Woman's College of Baltimore, showing the deep cavity or "crow's nest" used as a receptacle for water for domestic fowls 447

PLATE XCTI.

PLATE XCVI.

Maryland Potomac Cycads.

Cycadeoidea FoNTAiNEANA Ward. Page.

Longitudinal section through the Griffith trunk, No. 1467 of the museum of the Woman's College

of Baltimore, showing the internal structure and terminal bud 447

PLATE XCVII.

Maryland Potomac Cycads.

CrCADEOlDEA FoNTAINEANA Ward. i'age.

Fig. 1. The Noah Donaldson trunk, No. 1470 of the Woman's College of Baltimore 448

Fig. 2. The Cronmiller fragment, No. 1485 of the Woman's College of Baltimore 449

Fig. 3. The Griffith trunk, No. 1467 of the Woman's College of Baltimore 449

Fig. 4. Interior view of the Magruder fragment, No. 1489 of the Woman's College of Baltimore. . 449

Fig. 5. The Anderson fragment. No. 6346 of the Woman's College of Baltimore 450

PLATE XCVIII.

Maryland Potomac Cycads..

Cycabeoidea Fontaineana Ward. Page. Fig. 1. View from above of the R. P. Disney trunk, No. 2, being No. 6352 of tlie museum of the

Woman's College of Baltimore 450

Fig. 2. View of the base of the same _. 450

U. 3. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XCVIII

r I ^ - i

flCENTI METERS I

maw isai centimetfrs-i

CYCADEOIDEA FONTAINEANA.

PLATE XCIX.

Maryland Potomac Cycads.

Cycadeoidea GoncHERiANA Ward.

Side view of the Wilson trunlc, No. 1479 of the museum of the Woman's College of Baltimore.

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. XCIX

btj Wl IM ^^-NTIMETERS]

CYCADEOIDEA GOUCHERIANA,

PLATE C.

Maryland Potomac Cycads.

Gycadeoidea Uiileri Ward. Paee.

Side view of the Les trunk, No. 2 oi' the museum of the Maryland Academy of Sciences _ . 455

u. s. aeoLOGiCAL survey

MONOGRAPH XLVIII PL. C

CENTIMETERS I

CYCADEOIDEA UHLERI.

PLATE CI.

Maryland Potomac Cycads.

Cycadeoidea Bibbinsi Ward. Page.

Side view of the Polly Jones tmnlv, No. 1427 of the museum of the Woman's College of Baltimore. 468

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. CI

■WMCENTIMETERSl

CYCADEOIDEA BIBBINSI.

PLATE CII.

PLATE C 1 1 .

Maryland Potomac Cycads.

Cycadeoidea Bibbinsi Ward. Page.

Fig. 1. Side view of the Dennis Butler trunk, No. 1462 of the museum of the Woman's College

of Baltimore 469

Fig. 2. Side view of the Tubbs trunk, No. 146.5 of the museum of the Woman's College of Balti- more - - . - - 469

PLATE cm.

Maryland Potomac Cycads.

Cycadeoidea Bibbinsi Ward. Page.

View, natural size, of a radial section through tlie Smith fragment, No. 1483 of the museum of

the Woman's College of Baltimore 469

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. Clll

CYCADEOIDEA BIBBINSI.

PLATE CIV.

Maryland Potomac Cycads.

Cycadeoidea Bibbinsi Ward. Page.

Side view of the Gray trunk. No. 6354 of tlie museum of the Woman's College of Baltimore -169

PLATE CT.

PLATE CV.

Maryland Potomac Cycads.

Cycadeoidea FisuERiE Ward n. sp. Page. View of the external surface of the Hegeman trunk, No. 6345 of tlie museum of the Woman's Col- lege of Baltimore 47 1

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. CV

wiaia t

i;^.'^ -I CENTIMETERS I

CYCADEOIDEA FISHER/E.

PLATE CVI.

Maryland Potomac Cvcads.

Cycadeoidea Clarkiana Ward n. sp. Page.

View of the best preserved side of the Whiteliead trunk, No. 9050 of the museum of the Woman's College of Baltimore -..;.. 473

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. CVI

I- WW toJJ!!! aw mH jNaceNTIMETERSl

CYCADEOIDEA CLARKIANA.

PLATE CVII.

Flora of the Potomac Formation.

Page

Fig. 1 . Baierops7s plhripartita Font , 479

Fig. 2. Dioonites Buciiianus (Ett. ) Born . 479

Fig. 3. Feistmantelia virginica Font. n. sp 484

Fig. 4. Williamsonia ? gallinacea Ward n. sp - 48.5

FiG. 5. Cyoadeospermum obovatum Font. 485

Fig. 6. Aealia ? vernonensis Font. n. sp 492

Fig. 7. Celastrophyllum Brittonianum Hollick 493

Fig. 8. Ephedrites ? vernonensis Font. n. sp 495

Fig. 9. Populophyllum minutum Ward n. sp 499

Fig. 10. Scleropteris vernonensis Ward 501

Fig. 1 1 . Anient of a dicotyledon ? Font 515

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. CVII

FOSSIL PLANTS FROM THE POTOMAC FORMATION OF VIRGINIA.

PLATE CVIII.

Flora of the Potomac Formation.

Page

Fig. 1. DiooNiTEs Buchianus (Ett.) Born _ 479

Fig. 2. Dioonites Buchianus abietinus (G'pp ) Ward ._ 486

Fig. 3. Celastrophyllu.m alb.edomus Ward n sp 4S9

Fig. 4. Gltptostrobus brookensis angustifolius (Font. ) Kn 4S9

Fig 5. Aristolochi.ephyllum ? cellulare Ward n. sp 492

Fig. 6. Celastropiivllum Hunteri Ward - - 494

Fig. 7. Cela.stropiiyllu.m ? saliciforme Ward n. sp . 494

Fig. S. Mvrica brookensis Font .^IS

Figs. 9, 10. Leptostrobus ? ovalis Ward nom. nov _ 51

Fig. 10. Enlargement of Fig. 9, X 2.

Fig. 1 1 . PopuLOPHTLLUM MiNUTUM Ward n. sp 532

Fig. 12. Ginkgo 1 acetaria Ward n. sp 551

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. OVIII

FOSSIL PLANTS FROM THE POTOMAC FORMATION OF VIRGINIA.

PLATE CIX.

Flora of the Potomac Formation.

Page.

Fig. 1. Aristolochi.ephyllum crassinerve Font 481

Figs. 2, 3. Menispermites tenuinervis Font. . ■ 497

Figs. 4-6. Pinus vernonensis Ward n. sp 497

Fig. 7. Potamogetophyllum vernonense Font. n. sp .- 500

Figs. 8,9. Sphenolepidium Sternbergianum densipolium Font 515

Fig. 10. Equisetum marylandicom Font 517

Fig. 11. Sequoia cycadopsis Font... 533

Figs. 12, 13. Athkotaxopsis expansa Font, 'i 535

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. CIX

FOSSIL PLANTS FROM THE POTOMAC FORMATION OF VIRGINIA, MARYLAND, AND DISTRICT

OF COLUMBIA.

PLATE ex.

Flora of the Potomac Formation.

* Page.

Fig. 1. Glyptostkobus brookensis (Font. ) Ward. 495

Figs. 2-4. Populophyllum menispekmoides Ward n. sp 498

Fig. 5. Populus .\uriculata Ward 499

Fig, 6. Sterculia elegans Font. ? - 502

Figs. 7, 8. Thinnfeldia variabilis Font - . .502

Fig. 9. Baieropsis foliosa Font 504

Fig. 10. Celastropiiyllum brookense Font. ? , .505

Fig. 1 1 . Leptostrobus longifolius Font. 506

Fig. 12. Angiopteridium strictineeve Font 51 1

Fig. 13. Sequoia ambigua Heer - - 5.55

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. CX

FOSSIL PLANTS FROM THE POTOMAC FORMATION OF VIRGINIA.

PLATE CXI.

Flora of the Potomac Formation.

Page.

Figs. 1 , 2. Zamia Washingtoniana Ward . 503

Fig. 3. Baieropsis longifolia Font 505

Fig. 4. Onyciiiopsis psilotoides (Stokes & Webb) Ward 506.

Fig. 5. Sassafras eilobatum Font. ? 503

Fig. 6. Cladophleeis falcata Font 511

Fig. 7. Cladophleeis virginiensis Font 512

Fig. S. Frenelopsis ramosissima Font. 512

Fig. 9. Rogeesia angustifolia parva Font. n. var 523

Fig. 10. Saliciphyllu.\i ellipticum Font 524

Fig. 1 1 . Thyrsopteeis decdrebns Font 525

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. CXI

FOSSIL PLANTS FROM THE POTOMAC FORMATION OF VIRGINIA AND MARYLAND.

PLATE CXII.

PLATE CXII .

Flora of the Potomac Formation.

page

Fig. 1. Sphenolepidium Sternbergianum densifolium Font 507

Fig. 2. Dryopteris fredericksburgensis (Font. ) Kn 512

Figs. .3, 4. Quercophylldm chinkapinense Ward n. sp 513

Figs. 5, 6. Thyrsopteris crassinervis Font - 513

Fig. 7. Ctenopteris insignis Font. ? - - 521

Fig. S. Platypterygium densinerve Font. ? 521

Fig. 9. Rogeksia longifolia Font. - 523

Figs. 10, 11. Sphenolepidium Sternbergianum densifolium Font 524

Fig. 12. Ficus myricoides Hollick - - 531

Figs. 13-15. PiNUS sohista Ward n. sp - - 531

U. S. GEOLOQICAL SURVEY

MONOGRAPH XLVIII PL. OXIl

FOSSIL PLANTS FROM THE POTOMAC FORMATION OF VIRGINIA, MARYLAND, AND DISTRICT

OF COLUMBIA.

PLATE CXIII.

Flora of the Potomac Formation.

Page.

Fig. 1. Onychiopsis psilotohjes (Stokes & Webb) Ward 518

KiGS. 2, 3. Thyksopteris rabinervis Font 518

Figs. 4, 5. Zamiopsis insignis Font - 525

Fig. 6. Brachyphyllum crassicaule Font. 529

Figs. 7, 8. Celastrophyllum acdtidens Font 529

Figs. 9. 10. Eucalyptus rosierianus Ward n. sp. 530

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. CXIII

FOSSIL PLANTS FROM THE POTOMAC FORMATION OF MARYLAND AND DISTRICT OF COLUMBIA.

PLATE CXIV.

Flora of the Potomac Formation.

Page.

Fig. 1. PODOZAMITES PEDICELLATUS Font 532

Fig. 2. Sapindopsis variabilis Font. 532

Figs. 3, 4. Cladophlebis acuta Font. 538

Fig. 5. Cladophlebis acuta angustifolia Font, n. var 539

Fig. 6. Dyroptekis angustipinnata (Font. ) Kn 540

Fig. 7. Drtopteris parvifolia (Font. ) Kn. 541

Figs. 8, 9. Thinnfeldia marylandica Font. n. sp. 541

Fig. 10. Abietites angusticarpus Font - 556

U. S. GEOLOGtCAL SURVEY

MONOGRAPH XLVIII PL. CXIV

FOSSIL PLANTS FROM THE POTOMAC FORMATION OF MARYLAND.

PLATE CXV.

Flora of the Potomac Formation.

Page.

Fig. 1. Sphenolepidium Sternbergianum densifoi.iu.m Font 546

Figs. 2, 3. Abietites m.4ceocarpus Font. 548

Figs. 4, 5. Abietites marylandicus Font. n. sp 549

Fig. 6. Celastkophtlldm obovatum Font 550

Figs. 7, S. Dbyopteris heterophylla (Font.) Kn 550

Figs. 9, 10. Selaginella mary'l.4ndica Font. n. sp 553

Fig. 10. Enlargement of Fig. 9, X 3.

Fig. 11. Williamsonia ? Bibbinsi Ward n. sp 554

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. CXV

FOSSIL PLANTS FROM THE POTOMAC FORMATION OF MARYLAND.

PLATE CXVI

PLATE CXVI. Flora of the Potomac Formation.

Page.

Fig. 1 . Leptostrobus longifolius Font. ? 551

Fig. 2. Nageiopsis eecurvata Font. ?_ 552

Figs. 3, 4. Pecopteris vikginiensis Font. 552

Fig. 5. Acrostichopteris parvifolia Font _ 55S

Fig. 6. Celastrophyllum l-4.tifoliuii Font 559

Fig. 7. Celastrophyllum ? marylandicum Font. n. sp 559

U. S. GEOLOQIGAL SURVEY

MONOGRAPH XLVMI PL. CXVI

FOSSIL PLANTS FROM THE POTOMAC FORMATION OF MARYLAND.

PLATE CXVII

PLATE CXVII. Flora of the Potomac Formation.

Page.

Fig. 1. Adiantites parvifolius Font. n. sp 5.58

Figs. 2, 3. Celastrophyllum obovatcm Font 560

Figs. 4, 5. Nageiopsis angustifolia Font. 560

Fig. 6. N.ageiopsis heterophylla Font 561

Fig. 7. Plantaginopsis m arylandica Font. n. sp 563

U. S. GEOLOGICAL SURVEY

MONOGRAPH XLVIII PL. CXVII

FOSSIL PLANTS FROM THE POTOMAC FORMATION OF MARYLAND.

PLATE CXVIII.

Flora of the Potomac Formation.

Fage.

Figs. 1, 2. Plantaginopsis marylandica Font. ii. sp 562

Figs. 3, 4. Prote-ephyllum dentatum Font 563

Fig. 5. Prote^phyllum Uhleri Font. n. sp 564

U. S. QEOLOQICAL SURVEY

Monograph xlviii pl. cxViiI

FOSSIL PLANTS FROM THE POTOMAC FORMATION OF MARYLAND.

PLATE CXIX.

Flora of the Potomac Formation.

Page.

Fig. 1. Thyrsoptems Meek i ana Font 565

Figs. 2-4. Vitiphyllum multifidum Font 565

Fig. 5. Vitiphyllum multifidum Font 553

Figs. 6, 7. Pinites Leei Font. n. sp 570

Fig. 8. Araucarites virginicus Font 572

u. s. eeoLOQicAL survey

MONOGRAPH XLVIII PL. CXIX

FOSSIL PLANTS FROM THE POTOMAC FORMATION OF MARYLAND.