Sanagonennge tein bene rege ee ee Me Geer) Renita ONTO Fenty R Beata Wie DEPARTMENT OF THE INTERIOR MONOGRAPHS OF THE UNITED STATES GEOLOGICAL SURVEY WOE WIVES cb WIE TL Jeehey Ie IIc Iai sy WASHINGTON GOVERNMENT PRINTING OFFICE 1905 Set My fl Wein) rc dh NON ive elbiar ett So red || U7 VAY Ort, Ae UNITED STATES GEOLOGICAL SURVEY CHARLES D. WALCOTT, Director STATUS OF THE MESOZOIC FLORAS OF THE UNITED STATES SeeC @rN 2 3] 2AS ree BY LESTER F. WARD WITH THE COLLABORATION OF Witram M. Fonrainr, ArTHUR BIBBINS, AND G. R. WIELAND J2eyem IIE ISIbVe IDI DiSy WASHINGTON GOVERNMENT PRINTING OFFICE 1905 LIST OF THE PLATES. Coniferous plants from the Trias of Arizona Sketch map of the Little Colorado Valley, Arizona, and adjacent regions Sketch map of the Buck Mountain region and Cow Creek Valley, Douglas County, Oreg Jurassic liverworts and ferns from Oregon Jurassic ferns from Oregon Jurassic ferns and Equiseta from Oregon Jurassic cyeads from Oregon Jurassic cycads and Williamsonias from Oregon Jurassic Gingkos from Oregon Jurassic Gingkoacee and Taxacee from Oregon Jurassic conifers from Oregon Miscellaneous Jurassic plants from Oregon Jurasso-Cretaceous plants from Oregon and Alaska Jurasso-Cretaceous ferns from Cape Lisburne, Alaska Jurasso-Cretaceous cycads and Gingkoacew from Cape Lisburne, Alaska..........-----.----- Jurasso-Cretaceous conifers from Alaska, Montana, and California...........-.....-.-...--- Jurassic cycads from Wyoming Sketch map showing fossil localities of the Shasta formation of California Ferns from the Shasta formation of California and Oregon Cycads from the Shasta formation of California and Oregon Cyeads and conifers from the Shasta formation of California and Oregon Conifers and dicotyledons from the Shasta formation of California and Oregon Cycadean trunk from the Shasta formation of California Ferns from the Kootanie formation of Montana Equiseta and cycads from the Kootanie formation of Montana Cyeads and conifers from the Kootanie formation of Montana and the Lakota formation of South Dakota Exposure of the Potomac formation on Ontario avenue, Washington, D. C Exposure of the Potomac formation on Kansas avenue, Washington, D. C Exposure of the Potomac formation on Sixteenth street, Washington, D. C Exposures of the Potomac formation at Terra Cotta, D.C Exposures of the Potomac formation at Freestone, Virginia. .....-...-.-.--.---.---------- Exposures of the Potomac formation on Back Lick Run, Virginia.........-...-.-.--------- Map of the Potomac terrane in Maryland, the District of Columbia, and adjacent parts of Virginia VI VII-XIV XV XVI-XXVIII XXIX XXX-XXXIIL XXXIV XXXV, XXXVI XXXVII XXXVIIL XXXIX-XLIII XLIV XLV XLVI-LXIIL LXIV LXV—-LXVI LXVIL LXVIII LXIX LXX LXXI LXXII LXXIIL LXXIV LXXV LXXVI LXXVII LXXVIII LXXIX VI LIST OF THE PLATES. Plate. Cyead trunk and silicified wood from the Potomac of Maryland_.-......-..----.-.------- LXXXI Trunks of cycads early discovered in the Potomac of Maryland.....-...---.---.--------- LXXXI-LXXXVI Group of eyeads in the Museum of the Woman’s College of Baltimore...--.....-.--------- LXXXVII View of the Link Gulch with the Link eyead in place.-........-...-.------------------- LXXXVIII Group of cyeads in the Museum of the Woman’s College of Baltimore. .........-.--------- LXXXIX C@ycadeoideatmarylandicas: ct a0saa sean cae ose oe eae cae ae eee eae XO-XclL CycadeoideaTysoniana 20. 22-3. 425.22. ee nese ae ee ee He eee ee ee eee eee XCIL Cycadeoides; McGeeanazx2 iss Sob 8 Ste ie eee a sre se Sic eee ier eRe erator XCIV ‘CycadeoideaMonbaineanatrae ps Sees = Mise lea eee ee ereferet an siete ee eee rere fa la alae ge ea tel seatete ior XCV—XCVIII Cycadeoidea (Goucherianant: S23 leen 2 occa ascent ee oe eae XCIX Cycadeoides Whleric: 22522255 orc.coeen ne sae eee ee ee eee eRe eerste c Cycadeoidea Bibbinsiz203s2 soc )2n 2 oe Se te oye ese ere ee ee eco et eee are CI-CIV Cycadeoides ,Misherse:.2.)26/5 ioe oh eae a a erate eee eae eee eer tN cv C@ycadeoides;Clarkian aie WU et Sse ese ue ees e ayy. ey cls See ENC ete veep ne Uae CVI Fossil plants from the Potomac of Virginia, the District of Columbia, and Maryland......-. OVII-OXIX Je dive lay IL, ap Aws eee Triassic FrorA or ARIZONA. ARAUCARITES SHINARUMPENSIS Ward n. sp Page. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. | CONIFEROUS PLANTS FROM THE TRIAS OF ARIZONA. IPCAAN a 10L. PREGA AE ae lie Triassic Frora or ARIZONA. Brcse dl) 2) ARAUCARITES (SHINARUMEENSIS) Vand iis Deen setts ae ee eles tee ete tee U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. Il CONIFEROUS PLANTS FROM THE TRIAS OF ARIZONA. Ee a ie i Be aa x Je dba Mah JUD Pi AMI IIe, Triassic FLorA or ARIZONA. RTGS 1-55 CATA GARDE Nf O NITTATIGE: Rip pV VU CLT J Sree ed eee nr 35 Figs. 1,2. Views of the outersurface of the resinous bodies found in the interior of silicified stumps. Fig. 3. View of the interior of one of the same split longitudinally through the center. Fig. 4. View of x cross section of one of the same. f Fig 5. View of a piece of the wood from the interior of a stump with three of the resinous bodies attached to it, showing their moniliform arrangement. PL. Ill MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY CONIFEROUS PLANTS FROM THE TRIAS OF ARIZONA. Pb IIS: JUN, LE ba Ea EAE: Sketch map of the Little Colorado Valley, Arizona, and adjacent regions | U. S. GEOLOGICAL SURVEY Pre no ears ° ! \ |S / lw: Wa ok ~ \ ©.) Moa AVENE Tuya 2 easere aaa wes Moencopie % " Ta Se KC (AXA ORNs Houten Bright Angety WY [Rowes Welle ieee y, ’ X 36 Rain Tae HOPI IND. RES. LINE / / | eh |M Sea Sa? \ Wares Gross \ AOS AS ‘Spring 7) (= Fe fsa 9B Willian PRION uD (Mormon Moura SKETCH MAP OF LITTLE COLORADC o 10 20 Contour © MONOGRAPH XLVIII PL. IV Giants Chairs | Spring A “Hayward St.Joseph y yersre Z P st) atural Bridge | : ; } 'ETRKF IED! Middle Forest tae Ys ie \ fp h xT Lower Forest LOcar CANYON ANORY & CO BALTONO ME \RIZONA, AND ADJACENT REGION J so 60 miles ) feet LES IN? MONOGRAPH XLViII GEOLOGICAL SURVEY U. S. ; \ Lokasakal Spriie * ; aH Nottahndetit Spr Rf 8000 \ yf (as01) , ase: i as aN \ Rain . spies, IND. _RES. [ Slack Falls 4 =i = oes ae) es \\ / | af alates te X '¢ Taruters Spr. | ot | | a Canyor Diablo 2 ON : ; Mormon. ? Se | Pe ee f/hx ljountain 19 f rhs r ies ‘ Ibrook Z7er® fs if a é yr | @ me PO j “Jere ee Meera enrese As | ‘ine / \PETREFIED! MiddieForest / || Trugtks in razah REST t 7 Ex * Lower Forest 4, | q ales Y a Ni \ \ AO fp Sn -- 9 IS Woodruff Butte\\— - . on \ Woodruff } ° f x Waxioarr Crossing _ : bs | rf ' é —— z mood \ a a 4 o | = PortersTank \« L \ > \) 3 Soa! Vs Gide Ee) Pin 8 Bs < \ Neg J 1 | re AS — 3 Sink = x A is x Sinks ™\ +" al J | al cS) j . | $ i<\t i | s Wi Forty 1s ~ Hye i : ail | \ 42 a ie peeaee U Lienega SE aN \ eS pe Bat isa GUN | Casio C= ~ NG = 2 110° JE diye eT NY Pin NTI We, A Page. Sketch map of the Buck Mountain region and part of the Cow Creek Valley, Douglas County, Oreg..- 47 awonuava ‘coe KHON y —— ee Soytur 4 £ Ed T efeog oll OF pue avy SUOTIDOS PUB *(3v-va) OISSBINE 949 JO OMWIS oIRUITXOIdde ‘SOT4ITBOO] JuBId-fIssoy Surmoyus ‘OHMO ‘ALNNOO SWIDNOG AWTIVA MHEUO MOO GNV NOLDUY NIV JINOQOW MOON AHL AO d VW HOLHMS 08821 Zy 0 D sR AIM te aaa LO f Gi i ihe ong | arora Li Sin \ Y A 1d IIAIX HdVYSONOW AAZAYNS 791907039 “Sl “in Selly Nellie alle Ile Nestea ts Vell Jurassic FLorRA or OREGON. Fic. le MaRGHANTITES ERECTUSS (Bean) iSewel ascetics coc Reece meee eases eee Fig. 2. Enlargement of Fig. 1, 2. BIGSi3—95 DIGKSONTANOREG ONENSISm HOm by Sp seeps ae eae ee 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, < 2. PL. VI MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY JURASSIC LIVERWORTS AND FERNS FROM OREGON. ] Ma at PEATE va EAI AN ey celles JURASSIC FLORA OF OREGON. Fies. 1-10. DicksoNIA OREGONENSIS Wont. n. sp.-.-...----.-----.+---+2-++----+----++----------- Fig. 3. Pinnule of Fig. 2 enlarged, x 2. Figs. 6-8. Enlarged sterile pinnules showing nervation, « 2. Fig. 9. Enlarged fertile pmnules showing a sorus, X 2. Fig. 10. Fertile pinnule showing one sorus somewhat more enlarged than Fig. 9. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. VII JURASSIC FERNS FROM OREGON. lei Id) WOOL IP Ib Aa WE IE The JURASSIC FLORA OF OREGON. Fics. 1-3. ConlopreRIS HYMENOPHYLLOIDES (Brongn.) Sew-.----. eA a Un yy a 59 Figs. 2, 3. Enlarged pinnules of Fig. 1 showing sori, < 2. Figs. 4-11. Tuyrsorrerts Murrayana (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. 12-15. PotyeopruM OREGONENSE Font. 0. sp.---..-.-.-----.----------------------------- 63 Fig. 13. Enlarged pinnule of Fig. 12, X 2. Fig. 14. Portion of a pinnule of Fig. 12 x 4. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. VIII JURASSIC FERNS FROM OREGON. it VO aie Ame cua i? ae Pe Neste ae el a Coe 4) \ Nae TE by SE Ta IE OSG JuRAssic FLORA OF OREGON. Page. Figs. 1-8. PotyPpoDIUM OREGONENSE 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, 2. PL, IX MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY JURASSIC FERNS FROM OREGON. PLATE X IAL AW ANSE ene NGrs JuRAssic FLORA OF OREGON. Page. HiGS syle ROLYPODIUM OREGONENSE VE Ont na Spee see ee eee eee eye 63 Fig. 3. Enlarged pinnules of Fig. 2, x 2. Fig. 5. Portion of a pinnule of Fig. 4 enlarged to show the sori, < 2. Fig. 6. Enlarged sterile pinnule showing the nervation, < 2. Fig. 7. Enlarged fertile pinnules showing a sorus, < 2. IGS S240 CLADORH DEBRIS i VACOENSIS VAC ph Sp mene tae saree re ea na ee 66 Fig. 9. Enlarged pinnule of Fig. 8. x 2. Fig. 11. Enlarged pinnule of Fig. 10, x 2. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. X JURASSIC FERNS FROM OREGON. i ih nan oy Pb A Id CI, JURASSIC FLORA OF OREGON. Page. Hires) 1-7. CrApDoPHLEBIS DENDICULATA’ (Brongn®))\Nath=: 9592-225 - 2542 ene e ee] eee esac oe 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 neryation. Fics. 8-10: CLADOPHLEBIS HAIBURNENSIS (lL. & H.) Brongn...--....---.--.--/--1.-.-------.2.- 71 Figs. 9, 10. Enlarged pinnules of Fig. 8, x 2. Hies. 11,12: CLrADOPELEBIS ACUTILOBA (Heer) Hont. mn. comb. ---2.--__2-_-2 2-222 2 72 Fig. 12. Enlarged pinnule of Fig. 11. Eres. 13-15. CrADoOPHLEBIS| PECOPTEROIDES) Hont.m:sp2s-- 22-22-2225 2552 542s se eee eee ee ao eee 73 Figs. 14, 15. Portions of Fig. 13 enlarged, to show the nervation. MONOGRAPH XLVIII PL. XI U. S. GEOLOGICAL SURVEY JURASSIC FERNS FROM OREGON. Wry ay Put 4 ei Figs. Fes. Figs. Fics. 2G IE 1d) DIUM JURASSIC FLORA OF OREGON. [£35 SOLEROPTERIS | OREGONENSISMHONU-U0.S piers setse =o eee seer ae ee ee ee eee Fig. 2. Enlarged pinna of Fig. 1, x 3. Fig. 3. Enlarged pinnules of Fig. 1, x 3. 4=8) Rurrorpr’ Gaprnri (Dunk:)iSews 222-222. -2-2 2 see ese eee eee see eee eee Fig. 5. Enlargement of a portion of Fig. 4, to show the sori. Fig. 6. Enlarged pinnule of Fig. 4, showing one sorus. Fig. 8. Enlarged portion of Fig. 7, x 4. Gable Junacmunas| IN pals gome lees sooo cob ceadacsoamendaocosseHoosbomeasoccsos secns Fig. 10. Enlarged portion of Fig. 9, x 2. Fig. 11. Supposed original form of pinnule. 12 =p LENTOPTERTS#OROVILUENS ISH H ON tere eee reereeeltayetyate (okie tete tele teteetealetet etel a Fig. 13. Enlarged portion of Fig. 12, x 2. Fig. 17. Enlarged portion of Fig. 16, x 2. Page. 74 75 76 78 PL. Xil MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY 11 JURASSIC FERNS FROM OREGON. Jeb ek ad OIE de Jurassic FLORA Or OREGON. MiGs. V= 8h SLANTOPTERTS AMAT OR Desf Ge TLE eos ne se ees a pag Ropar ea pan Wig. 2. Enlarged portion of Fig. 1, 2. FTG So gS ee eNO PD RTS VAT AA es) Un Ron Vig. 8. Wnlarged portion of Fig. 7, x 2. HTGS Ol ON MONT OP TOR TS \(XORIG ONIN STS) k OTE aT GS pete estate aan Vig. 10. Enlarged portion of Fig. 9, x 2. PL. XIill MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY JURASSIC FERNS FROM OREGON. Bhace Ssh aera ASO 4 ; hp Me Brit re IPG AN WP, SCID We, JurAssic FLORA OF OREGON. HyrGsel 459 MACRO DAENTOPTERTSH CALE OTINILG AUi HO Tit se sep ae eee tee 82 Fig. 4. Pen drawing of a portion of Fig. 3, natural size. lneey Fall, Srcmrornwis (Coops, Wem. -odosecosascovosesssbees soesécceooseadecen sss odse= 83 U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII_ PL. XIV JURASSIC FERNS FROM OREGON, PAs Saye e =| JEL A IE Ja) OW JURASSIC FLORA OF OREGON. Fies. 1-3. SaGENopTeris PAucirotta (Phill.) Ward n. comb___-_-_.---------------- Figs. 4,5. SAGENOPTERIS GRANDIFOLIA Wont. n. sp___-__-.-.----------------------_- Wig. 5. Pen drawing of a portion of Fig. 4, natural size. INE S> G8), IDA OATS SROMAIM MOMs is \DsSoes5 sass es secscesessescceeselssosse2 se Fig. 7. Enlarged pinnule of Fig. 6, « 2. Fig. 8. Portion of same still further enlarged to show the capsules, 3. Fig. 9. Another enlarged pinnule, showing the capsule near the base, < 2. DIGS OS EH OUISERUMES pli O Mt ete a ae type crepe eo pee eA ee ar aren ny a Ne ite 88 PL. XV MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY JURASSIC FERNS AND EQUISETA FROM OREGON, ah ee eet if My LIS SOL Fires. 1,2. Kies. 3-9. Fries. 10-13. JP Gy a We OX WIL JuRASssiIC FLoRA or OREGON. Page. Piniioyanwviarots ILjperconyeyn (ible) Nana. 52. oo bees eek oe oe tk oo leo ee bce e sek 89 Fig. 2. Enlargement of Fig. 1, x 2. NIESONTATORMEN TALIS ELC R serayer 5 eave uae casper eet a ae Ra sR RS 90. Fig. 8. Portion of Fig. 7 enlarged, 2. NIvSONIA ORIENTALIS MINOR Womnts mn. yar) 2222222242202 2222222 Ais Ie a oo 92 Fig. 11. Summit of Fig. 10 enlarged, 2. PL. XVI MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY JURASSIC CYCADS FROM OREGON. Rane ves Sais noes f Jee Is OWE IT JuRAssIC FLORA OF OREGON. Fies. 1-7. NiLsonra PARVULA (Heer) Font.n. comb.........................-...- Fig. 5. Enlarged portion of Fig. 4, * 3. Fig. 7. Enlarged portion of Fig. 6, X 3. EIGS aS O SPN SONTAGNTER ONIENSTS IN Y(O Kore ees eet a eee Fig. 9. Pen drawing of a portion of Fig. 8, natural size. Hires ll 4 NimsonrAcomenAn (esi) GO pps ase ee eas ee Fig. 12. Enlarged portion of Fig. 11, x 3. PL. XVII MONOGRAPH XLVIII U. S GEOLOGICAL SURVEY JURASSIC CYCADS FROM OREGON. ‘ : i 7 PUA oc . Je I AA J, OW IE I JuRAssic FLORA OF OREGON. Fias. 1-6. NILSONIA PTEROPHYLLOIDES Nath Fig. 3. Enlarged portion of Fig. 2, x 2. Fig. 6. Enlarged pinna of Fig. 5, x 3. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XVIII JURASSIC CYCADS FROM OREGON. JE IN AE 1) DOO, JURASSIC FLORA OF OREGON. Page BIGSse 16s LEER OPEN T UM eA HORS is Cla eM kee ete ene ee 97 Fig. 3. Enlarged portion of Fig. 2, x 2. HriGss 7oll PrER OPEL E UM CON DIG UUMe SC lier Keg e aye ae rea eee od 99 Fig. 8. Enlarged portion of Fig. 7, 2. Fig. 10. Enlarged portion of Fig. 9, X 2. PL. XIX of MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY JURASSIC CYCADS FROM OREGON. slate oe ei aes iy 12 ID AE Jas BOS JurRAssic FLORA OF OREGON. Figs: 1-7. PreROPHYLLUM XQUALE) (Brongn.) Nath.---:...-----2-2--2.------------------------ 100 Fig. 3. Enlarged portion of Fig. 2, < 2. PL. XX MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY JURASSIC CYCADS FROM OREGON. ' PLATE SOR Qs ee TP Ib AN AE 1, DOC IE, JURASSIC FLORA OF OREGON. Page Hise —72) PREROPHYLLUM> RAIMA AL ENS Es MOTI ss ere sen) e sais eet ee eee ele eee tees 102 Fig. 2. Enlarged portion of Fig. 1, x 2. Fig. 5. Upper part of Fig. 4, enlarged, x 2. HIGS18) 9) PLEROPEMWL LUM yMUN US| ESOT ET este ye ert ee ete eee terete eter ee eee 104 Fig. 9. Upper half of Fig. 8, enlarged, x 3. PL. XXI MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY JURASSIC CYCADS FROM OREGON. = om ae pas (PLATE: Kan. IE bp ek AN 1d) OC IED, JuRASSIC FLORA OF OREGON. Figs. 1-5. CreNopHYLLUM ANGUSTIFOLIUM FWont_--.--..-----------2-- 222-22 --2- 222-22 eae Fig. 3. Enlarged portion of Fig. 2, x 4. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XXil JURASSIC CYCADS FROM OREGON. of ) ; a) fe A OIG an IPG ANNIE Oy OS OIE IL JuRASSIC FLORA OF OREGON. Page WIGS Sel den CHEN OPE YGL UNG) PAG EDYaN ETRE LOM tepals [0 eae ere 106 Fig. 4. Enlarged portion of Fig. 3, x 2. Figs. 5-12. CrenopHyttum Warp Font.........---------- sud A ACen AO MD sea, MAU ae Natl 107 Figs. 6, 7. Enlarged portions of Fig. 5, x $. Fig. 12. Pen drawing of Fig. 11, natural size. PL. XXill MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY JURASSIC CYCADS FROM OREGON. Wee uty ay ee Net ves = iad Be PAE XO IPD AIP 1B) XI WW Jurassic FLrorA oF OREGON. Page. Tes, NO), Pomerania muvorinnios Jaber 4 co sasccoonescaccosconocaseesoecnescqasccces | MOE Fig. 2. Enlargement of Fig. 1, X 2. Fig. 4. Enlargement of Fig. 3, X §. Fig. 9. Enlargement of Fig. 8, X 2. Hicssdil=165 PopozAMImESsPACHYPHYDLUS /Hont 0 |Spya= ana eee nene reset see eee eee 109 Fig. 15. Enlargement of Fig. 14, X 3. BG seuli7=2 0 mLOD OZAMUEDESHTANGE OWA USI (emp com ble) Hires rae eee ett 110 Fig. 20. Pen drawing of Fig. 19, natural size. MONOGRAPH XLVIII PL. XXIV U. S. GEOLOGICAL SURVEY JURASSIC CYCADS FROM OREGON. Cay es ath Ris ee Visine a i j ai ¥ ‘ ‘ { ei ‘ 4 4 Figs. 1-4. Popozamires LANCEOLATUS minor (Schenk) Heer Fies. 5-7. PopozAMIrEs LANCEOLATUS LATIFOLIUS (Fr. Br.) Heer lig. Fic. PAG a i XOXO: JuRASSIC FLORA OF OREGON. Fig. 2. Enlargement of Fig. 1, x Fig. 4. Enlargement of Fig. 3, >< 2. Fig. 6. Enlargement of Fig. 5, x 3. 8. Popozamires ? PACHYNERVIS Font. n. sp --- 9. Crenis suLtcicauLis (Phill.) Ward n. comb Page, 111 112 112 113 U. S. GEOLOGICAL SURVEY PL. XXV MONOGRAPH XLVIII JURASSIC CYCADS FROM OREGON. ‘ : fi t Sie i ya Hise ’ , ys Pej A PAE XEON JURASSIC FLORA OF OREGON. Mek 13, GroniS SULOCAGHNS (PWIL) WWemel is orn)... 55 55 5e5 5225.52 22s s2ssesee2ssesceaescee- Fig. 2. Enlargement of Fig. 1, x 3 3. F 4, ¢. 6. Enlargement of Fig. 5, x U. S. GEOLOGICAL RVEY SURVE MONOGRAPH XLVIII PL. XXVI JURASSIC CYCADS FROM OREGON. ’ . i h ‘ ‘ 1 + Ht \ 12 Ibp sek I Jay OX ROW ILI. JURASSIC FLORA OF OREGON. KiGS1=51 CrENIS/OROVILEENSTS) | Om fp eee ee eat ea oe ees nea NCU Ae re et te Fig. 2. Fragment of a leaflet of Fig. 1, natural size. Fic. 4. Pen drawing of Fig. 3, natural size. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XXVII JURASSIC CYCADS FROM OREGON. | f | | Teal) MOG IOUL , ie | Fig. 1. CreNi Figs. 2-8. Creni IGA MEO CCW EE? JURASSIC FLORA OF OREGON. Page SUOROVILLENSIS# EOD betes ea oe sec le Rie Ce RS Sieh Lev fed pat Deas ge yaa STUER 115 SW GRANDIFOUIA MMOm tse steely ese = ey ON ec Die Pe SRL en oUt ce ies pat ete syne Fig. 4. 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. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XXVIII JURASSIC CYCADS FROM OREGON. PiEATH ane 7 IPG AN a, WO ROITI JURASSIC FLORA OF OREGON. Page. Fic. U5 CRENISH AORICU LATA VIO Itsy Hee ect uo rs 1B ee Nea c= Oey Os Pn) Lo 117 Fics. 2,3. ENCEPHALARTOPSIS ? OREGONENSIS Font. n. sp.--.--------------------------------- ~ 117 Fig. 3. Pen drawing of Fig. 2. Fig. 4. CYCADEOSPERMUM OREGONENSE Wont. n. sp.--/---2-22222222------2-2- 2220-22222 118 Fic. Dsl CY. CADEOSPER MUM MO VAC UME OT ten 1S 0 Stray at ees re ae 118 Fic. 6: WILLIAMSONTAY OREGONENSIS) Hontsmwsps- 22-22 eee see ones eens 118 Fic. Uo WHO ORIN Ugo, Mois, (UBC INO, I) cocoscosde od occas sscedecbesnoetaceecacee 119 JOKER GLO WU MICORIN Yo, Oo, (Braver, INO, Ma). 5 525 sb sch sess sces soceksseccdeessse 119 Fig. 9. Enlargement of Fig. 8, « 2. Fic. OS VVANUATE TANS ONITAUN2YS PD SMIEL OT em (IDs ret IN (Os) Bae en 119 Fics. 11,12. Witiiamsonia ? sp. Font. (Bract, NONI 2G) Se See eo Ae rene NE ee aS aide ee a 119 Fig. 12. Enlargement of Fig. 11, x 2. MONOGRAPH XLVIII PL. XXIX U. S. GEOLOGICAL SURVEY JURASSIC CYCADS AND WILLIAMSONIAS FROM OREGON. TRG IA IE IB) 2X OX OS, JURASSIC FLORA OF OREGON. Page. INKS, W=7/5 Chericeo) WUCOVON (VBicormfeins)) IGOR ooo Geen ened e essen ss sces ee seea te seudoeedsse 121 Fig. 2. Pen drawing of part of Fig. 1 to show nervation, natural size. Fig. 5. Pen drawing of Fig. 4, natural size. Fig. 7. Pen drawing of Fig. 6, natural size. Fics. 8-12. Ginxco Hurront (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. 4 , PAU SOO ae a » ’ i a i = | tp Jey ek IU Teh OC OC TT JuRAssic FLORA OF OREGON. Fies. 1-3. Ginxco Hurront (Sternb.) Heer Fig. 3. Pen drawing of Fig. 2, natural size. Fias. 4-8. Ginkgo Hurront MAGNIFOLIA Font. n. var_...----- 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. r “ 4 ne ‘ Meare IGN SEB DOI IE JuRAssIcC FLORA OF OREGON. Page. hGeS. I, W, (Ciaiaeo) Ishumwo wpe WeVerpooO WN INOMIs IM, WR === Le ee Soke se sos da esses ss see 355525 124 Fig. 2. Pen drawing of Fig. 1, natural size. Hees, SHSh Cumnpceroy Meo IER Joes Se ee en es so se ena socees Kobees He odes So ccoseade cesses 125 Fig. 4. Pen drawing of Fig. 3, natural size. Fig. 7. Enlargement of Fig. 6, X 4. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XXXII JURASSIC GINGKOS FROM OREGON. Nees ee Ae al 1210, BVI IB) OK SCOUT IL JuRASSIC FLORA OF OREGON. Bias W119 GiInkG ObsSIBIRIGAay eens Sp oa SHS RN 1 Ue yee CNR RB a SA UNO TO a Vig. 4. Enlargement of Fig. 3, x Fig. 6. Enlargement of Fig. 5, x 3 % Fig. 10. Enlargement of Fig. 9, * 3. Wig. 13. Enlargement of Fig. 12, x 2. Vig. 15. Enlargement of Fig. 14, x 2 Fig. 17. Enlargement of Fig. 16, * 2. Fig. 19. Enlargement of Fig. 18, x 2 U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIIl PL. XXxXIII JURASSIC GINGKOS FROM OREGON. JEG ID IB) OC Oe OIDs JuRASsSIC FLORA OF OREGON. Page. Fias. 1-12. Giyxeo sp. Font., aberrant forms of leaves... -------------------------------------- 127 Fig. 2. Enlargement of Fig. 1, x Fig. 4. Enlargement of Fig. 3, x wwn Fig. 6. Enlargement of Fig. 5, < Fig. 8. Enlargement of Fig. 7, < 2. Fi Fig. 12. Enlargement of Fig. 11, * 2. g. 10. Enlargement of Fig. 9, X 2. Rigs 13) 14. PHasnicorsisitisp. (Monta 225 cei oe ees are Sekar eee one teeta oe arees ssp e ee 128 Fig. 14. Pen drawing of Fig. 13, natural size. RIGS 5S eA XIRESSZ/AN OMDES ys (Me Cl) Se Weer ete steerer ge a re a 129 . Fig. 16. Enlargement of Fig. 15. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XXXIV JURASSIC GINGKOACEAZ AND TAXACEAZ. FROM OREGON. a Ne a ss * PM OC Y, | co Fries. 1-3. Taxires zAmiorpes (Leck.) Sew Je ek A 1) GO OW, Jurassic FLORA OF OREGON. Fig. 2. Enlargement of part of Fig. 1, < $. Fics. 4-8. BrAcHYPHYLLUM MAMILLARE Brongn Fig. 5. Enlarged portion of Fig. 4, x 2. Fig. 7. Enlargement of Fig. 6, X 2. Fic. OMAR AU OARIEES 21s 5eE OMten (GOMEYSCale)) epee ae ace aes nen eo Fics. 10-17. Pinus NorpensxiéLp1 Heer Fig. Vie. Fig. Fig. 11. Pen drawing of Fig. 10, natural size. 13. Pen drawing of Fig. 12, natural size. 15. Pen drawing of one of the leaves shown in Fig. 14, natural size. 17. Pen drawing of Fig. 16, natural size. Page. 129 130 131 131 PL. XXXV MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY JURASSIC CONIFERS FROM OREGON. ) : ¥ } ‘ ATH soy ae ae (were ay PEAS i xOXe Xe Viale JurRAssic FLORA OF OREGON. Page Kies ls OyOLORIIYS|OREGONENSISsHont sn Sp seas eee ee se eee ee aera see eee eel 2 Fig. 2. Enlargement of Fig. 1, X 3. Fics. 3-8. SPHENOLEPIDIUM OREGONENSE Font. n. sp_..-...---------------------=---=---------- 133 Fig. 4. Enlargement of Fig. 3, < 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 shown in Fig. 6, X 2. Fics. 9-12. SAMAROPSIS ? OREGONENSIS Font. n. sp.--.-.------------------------ Se Arana Aree ae Se 134 Fig. 10. Enlargement of Fig. 9, X 3. Fig. 12. Enlargement of Fig. 11, < 3. Wigs eles) Maleramentioliconiterssea ne aeeae see eee renee eee eee ee centre a eeercernciers nian: 185 MONOGRAPH XLVIII PL. XXXVI U. S. GEOLOGICAL SURVEY JURASSIC CONIFERS FROM OREGON. 1 AUNa SKOOL | IB USP, NOU CIANlS) TENSIONS SHON Yl) Sopecet cca se ae cease oceacasabocseasecese Vig. 2. Pen drawing of a portion of Fig. 1, natural size. Bigsy 8h4s Undetermined eat o No sale aps ris iets teat ey eee Ee 2 an apa Una Oren Fig. 4. Pen drawing of one of the leaves of Fig. 3, natural size. RiGss = 516s UndeterminedilestNo 2 eee en ete ee aye ues rea eNO eR Fig. 6. Pen drawing of a portion of Fig. 5, natural size. BiGss 97,85 CARPOLIREUS OLADLENSIS) VViand) iyispe ees e so ease ee ae Fic. O), CArmexonansnois Ione ANpoyme WAV Ye oe oe oo oases sae ce eoesseaecsssse8 Kies. 10,11. Carporrraus OREGONENSIS Mont. n. sp_------------------+------------- * Fic. 125 CARPOLITHUS ELON GAT US» LOLs ies [ae eeee es aie ene ee Oo eee Fic. 13. CARPOLITHUS DOUGLASENSIS Wont. n. sp--.---------:-------------------- Je AMID IB; OOOO IL ID JURASSIC FLORA OF OREGON. PL. XXXVI MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY MISCELLANEOUS JURASSIC PLANTS FROM OREGON. oi iene cota eri ; Tae mlb) Peter) ties cy Fies. 9,10. Iie, Wil, 12, Kies. 13, 14. Fies. 15-18. Fies. 19, 20. Fic. PA Me Ib NAT 1B, OX OX EW ILO I JURASSO-CRETACEOUS FLORAS. Fig. 4. Enlargement of Fig. 3. i CLADOPHEEBIS! SVACCENSIS) \VWWiald aesed setae ose reyes ecient ara) Ore Pee VN ee Fig. 8. Enlargement of Fig. 7, x 3. CTENORHY DUM US pe H Ome sei Sp ise ees pee eee ta gL Fig. 10. Enlargement of Fig. 9. Fig. 12. Enlargement of Fig. 11. OTOZAMITES OREGONENSIS Font. n. sp ..-.-----!------------------------ ey eves Sse TAXITESZAMIOIDES) (deck) i Se we cs ess ysreee ke te lens Doe elle cea era Ge p eaps uon e Fig. 16. Enlargement of Fig. 15, x 2. Fig. 18. Enlargement of Fig. 17, « 2. BTER OP ELYED UNG VAT AG ICE N'S Bish OM Geel: See aie ee aaa es ree Fig. 20. Portion of Fig. 19, enlarged, < 2. SAGENOPERRISHALASKIENSISVE OU: sts pee es et ee ele U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XXXvVIII JURASSO-CRETACEOUS PLANTS FROM OREGON AND ALASKA. « ‘ * \ 4 , Ly * =a) of 12 IG ACI IB) OX SOOT, JURASSO-CRETACEOUS FLORA OF CAPE LISBURNE, ALASKA. BGSs 1:2" DICKSONDAKSAPOR DANA El CO Tees oe pee a ears a ee rT Fig. 2. Enlarged portion of Fig. 1, x 3. Ties. 3-6 ONycHIOPsIs PSILOTOIDEs (Stokes & Webb) Ward n. comb --..-..--.----------------- Fig. 4. Enlarged portion of Fig. 3, x 3. Fig. 6. Enlarged pinnule of Fig. 5, x 3. + RUIGSe io CLADOPHEEBIS) VA CCE NSIS Vfl Cee pee ere ate ae a Fig. 8. Enlarged portion of Fig. 7, x 3. Eras 9112s CLADOPHUEBISHATEAT AY ¢ Moma bi ye aaiee eases eae oe he re ae eee Re eae a ere 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. Naresh aa Vi K ui Jedbve as Ib, Ve I NAC TB, OSC IG 8 JURASSO-CRETACEOUS FLORA or Cape LispuRNE, ALASKA. MGS TES), Choa IS ANLAWA INO naoc a5 CoS see Se ceca cs oceu Se ensesccecs soon goasee bas sesene- 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. PL. XL MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY ALASKA. CRETACEOUS FERNS FROM CAPE LISBURNE, JURASSO ‘Nui ins ye ptf bl , mat ly cess Pa ES XG alee JURASSO-CRETACEOUS FLORA OF CAPE LISBURNE, ALASKA. Page Figs. 1-5. CLaporpuLeBis Hurroni (Dunk.) Font. n.comb.._...........--.-----.------------.--- 161 Fig. 2. Portion of Fig. 1 enlarged, x 3. Fig. 3. Pinnule of Fig. 1 enlarged, X 2. Fig. 4. Pinnule of Fig. 1 enlarged and restored < 3. oO. Fig Portion of Fig. 1 enlarged and restored x 3. Coe Vey Es PL. XLI MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY ‘VHSVIV “ANUNESIT 3dvO WOUS SNYa4 SNOSOVL3aYO-OSssvUunr ‘VASYIV ‘SNuNsSIT 3dv0 WOYS SNYS4 SNO30vVL3y40-Ossvunr ABAUNS 1V9IDO1035 ‘Ss “N NX Td «IATX HdVEYDONOW f wary Meats rst Oh aaenane r 7 AN 1 aye a an at @ i eae ee | VATE Oc, = a's IPI AVAL 18, DC IU IE IL JurAsso-CRETACEOUS FLORA oF Carr LisBURNE, ALASKA. BTGSei— 3h CHADOPHGEEBISHLL Umno nt: OD Umi) Bomtesrts:C Onno Sea aoe reed ee 161 Fig. 2. Enlarged pinnule of Fig. 1, x 2. Fig. 3. Portion of Fig. 1 enlarged and restored, X 3. U. S, GEOLOGICAL SURVEY MONOGRAPH XLViIII PL. XLII JURASSO-CRETACEOUS FERNS FROM CAPE LISBURNE, ALASKA, hes soe ee te PID ING 18) OX Ib IT IG I. JuRASSO-CRETACEOUS FLoRA oF CAPE LisBURNE, ALASKA. Page, Figs. 1-7. Ciaporutesis Hutrronr (Dunk.) Font. n.comb -..-..-------------------------------- 161 Fig. 2. Portion of Fig. 1 enlarged, < 2. Fig. 3. Pinnule of Fig. 1 restored and slightly enlarged. Fig. 5. Enlarged pinnule of Fig. 4, x 2. Fig. 6. Pinnule of Fig. 4 restored and slightly enlarged. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XLIII JURASSO-CRETACEOUS FERNS FROM CAPE LISBURNE, ALASKA. AE Salen Fig. ile Via. 2s Figs. 3, 4. Figs. 5, 6. Wigs. 7, 8. Lee AU IDE CID AL WE JURASSO-CRETACEOUS FLoRA oF Cape LIsBURNE, ALASKA. Page PODOZ/AMIES 6 GR SIND LEO TELUS e110 Titra se aes eet ncn en Le 167 BATERAY GRAGCIL ISH (Sear) Ge Unb de cays ene tean ey alae ole ape see Nata estes an ache agen Nn ani an 168 GOING OD TUE 2 VAWASICE NS Enh O Nts TKS |p seen ee eee (een oo ARNE UWS Seca eae 168 Fig. 4. Outline sketch of Fig. 3 showing the plan of nervation, natural size. GinkGo pigirara (Brongn.) Heer__- 170 GING OMPEL Wa ONTANEA GHINITIR© AITAGN El CTT tek seen a 170 U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XLIV JURASSO-CRETACEOUS CYCADS AND GINGKOACE4 FROM CAPE LISBURNE, ALASKA, LAs OLY, Pa AG Xe Vee JuRAssO-CRETACEOUS FLORA or ALASKA, MONTANA, AND CALIFORNIA. Page. Fics. 1-5. Nagetorsis Loneiroiia Font. 4 from the Jurasso-Cretaceous of Cape Lisburne, Alaska-... 171 Fig. 4. Enlarged portion of Fig 3, X 3. Fic. GUBRACHY PHY DUT MEeaS TORRSTIN VV ALG Miler sp sere ee a eee et 176 Fics. 7,8. Sequoia Reicnenpacut (Gein.) Heer from the Jurassic or Lower Cretaceous of Mon- LIC 0 Ae ee ee ea oe Pees rts ee RCI ae Haina a RC oas WO iA AN Etec doy 177 Fig. 8. Enlarged portion of Fig. 7. Fics. 9-11. Sequora FarrBankst Font. n. sp. from the Jurasso-Cretaceous of Slate Springs, Cali- MONOGRAPH XLVIII PL. XLV U. S. GEOLOGICAL SURVEY AND CALIFORNIA. ) JURASSO-CRETACEOUS CONIFERS FROM ALASKA, MONTANA Pas ae if SO) ee ¢ rae Fe ye PA AV ARSE OXI lie JURASSIC CycADS FROM THE FREEZEOUT Hi~Ls, WYomiInG. CYCADELTA) WYOMINGENSIS) Wardss 2 c(5 2 = Ways aaa a cic Une IT cai ere uy legs Bree a ae at Ue a 183 View of one side and part of the base of the trunk consisting of Nos. 500.88, 500.513, and 500.525 of the museum of the University of Wyoming. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XLVI es |] CENTIMETERS JURASSIC CYCADS FROM WYOMING. rt ’ Sot 4 IP IG AN I Id) IG We IE I JURASSIC CYCADS FROM THE FREEZEOUT HiLis, WyomIne. BGSilht2 | CYGADELDAG KONO WTO NITAIN AU AVIAN ieee ote tay ae ea eS 185 Side views of the fragments Nos. 500.94 and 500.498, respectively, of the museum of the University of Wyoming. Fic. 3. CycapELta Reepir Ward....--- - rere teeter Nia i share Se eMC AST A 182 Side view of the small trunk No. 100.239 of the museum of the University of Wyoming. Fia. ANIC Y CADELLAY/ COMPRESSAU VAN sees ote ere Pape a ate ep eater ole eS EE pee 186 Side and top view of the small trunk No. 100.264 of the museum of the University of Wyoming. “ONINOAM WOYS SGVOAO Olssvunr SHSLAWILNSO [ieee SHSLAWILNSD FI ie HNATX “Id IIATX Hd VYSONOW A3ZAYNS 1V9IDO1039 ‘Ss “N PLATE XiVan JE Dp IE Th OI WEE IE IC. JURASSIC CyCcADS FROM THE’ FREEZEOUT Hitis, Wyomine. CYCADELLA'GOMPRESSA’ Wand 35250325 aay Sa Bea) ct ce eee ne 156 Fic. 1. Side and top view of the small trunk No. 500.503 of the museum of the University of Wyoming. Fic. 2. Side view of the small trunk No. 100.228 of the museum of the University of Wyoming. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XLVIII CENTIMETERS JURASSIC CYCADS FROM WYOMING. 45, IPTG ANE 1d OC Thy WC Jurassic Cycaps FROM THE FREEZEOUT HiLLs, WYOMING. OMOVUOEIUN BIUIDASISION Wem 566 6 S65 co pmo co co aseoeecoBoadcossse bese coeese se sesssesetssoces 186 View of the surface of the segment resulting from the union of the fragments Nos. 100.204 and 500.507 of the museum of the University of Wyoming. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XLIX CENTIMETERS JURASSIC CYCADS FROM WYOMING. Ll ned IPI AW Ib) JuRAssIc CycADS FROM THE FREEZEOUT HiLis, WYomING. CYCADELLA’ NODOSA Warde ee 2 ens Mes Se Ne ous oe ah Atay eae ally Se ar eek Se ee Ce eee Side view of the trunk No. 500.509 of the museum of the University of Wyoming. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. L RM CENTIMETERS JURASSIC CYCADS FROM WYOMING. ey Av Ana lel JuRAssic Cycaps FROM THE FREEZEOUT Hi~Lts, WYomine. @ROADELWAV:NODOS'A I VVGLIC bey yea ey oye EM a el elle yee er Ve a urege Seed re ASL Eeyore 187 Side view showing also part of the base of the trunk No. 100.206 of the museum of the University of Wyoming. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. Li Hl ST CENTIMETERS JURASSIC CYCADS FROM WYOMING. : aa Neat ages emer thse ane st ae IP Wb AN TB Wb WEL JuRASSIC CycADS FROM THE FREEZEOUT HiLLs, WyomIne. Vic. 1 -¢ LRA YRSOPTERIS SE ULIPTICA: Bombe ey 1 ey Sy 5 ates he APS ORC SNE ety SL ey sre eee . CLADOPHLEBIS FALCATA MONTANENSIS Font.n.comb._-........-.-..-.---.-------.--- Fig. 16. Portion of Fig. 15 enlarged, x 2. Fig. 18. Pinnule of Fig. 17 enlarged, 2. MCLADOPHUEBIS SHE DER OP Hiv WAH OM be eve erect ere ey Ap ey es Oe neh RI Fig. 22. Pinnules of Fig. 21 enlarged, x 2. i CLADOPHERBISUCONSTRIOD Aes HQ Ti teat eae eee ae eee MONOGRAPH XLVIII PL. LXXI U. S. GEOLOGICAL SURVEY Aa. [eee | —————S wn SSOQUG Z SSS Kaw FERNS FROM THE KOOTANIE FORMATION OF MONTANA. ae i iis ey uh Figs. 1-11. Figs. 12-14. Fics. 15, 16. Kies, 17-21 IP AG ATE IB) Jy OX UIE FLORA OF THE KooraNIE FORMATION. Eqursetum Puitupsu (Dunk.) Brongn Fig. 9. Portion of Fig. 8 enlarged, < 2. Fig. 10. Portion of Fig. 8 enlarged, x 3 and restored. EquisetuM Lyevunr Mant Fig. 14. Portion of Fig. 13 enlarged, >< 3 and restored. LycoropitEs ? MONTANENSIS Font. n.sp Fig. 16. Portion of Fig. 15 enlarged, x 2. Nitsonra ScuauMBuRGENSIS (Dunk.) Nath MONOGRAPH XLVIII PL. LXXII S. GEOLOGIGAL SURVEY u. MN EQUISETA AND CYCADS FROM THE KOOTANIE FORMATION OF MONTANA. by Ride & AO, TEeXexa ale JP I Ih WL OX III FiroraA OF THE Koorante FORMATION. Fics. 1-6. Zamires arcricus Gépp Fig. 6. Portion of Fig. 5 enlarged, x 4. Fie. 7. CYCADEOSPERMUM MONTANENSE Wont. n. sp ..--------------+---+----+-2------------ Fia. 85 CEPHALODAKOPSIS BRVAMLOS AH OM tral seeps ee eae Fic. OP SNA GEIOPSIS) TON GIFOLVA WM ODbe so: es Ae eS Lye ne aa gy a a Sea Ep Vic. LORSNAGETORSISHMONTANENSIS sO nites 10: [este ater yea Fies. 11-14. Laricorsis LONGIFOLIA LATIFOLIA Font. n. var FLorA OF THE LAKOTA FORMATION. Fic. 15. (a-c). NILSONIA NIGRACOLLENSIS Wieland n. sp Fic 15d AYR SOPTERIS DEN TER OL LA HOM tees ocean Cea a ae U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. LXXIII Nal WHEE Wy Hey |] / “2 = fh) ~~ Nae i mm Z A, YCADS AND CONIFERS FROM THE KOOTANIE FORMATION OF MONTANA AND THE LAKOTA ee e FORMATION OF SOUTH DAKOTA. VW Bae Sais er AME Xx, IP LN AU IB) I CTW View of exposure on Ontario avenue, in rear of Lanier Heights, Washington, D.C., looking north, show- Page. ing the Rappahannock sands of the Potomac formation resting on the crystalline rocks. From a ‘0 ‘d ‘NOLONIHSVM ‘A3NNSAV OIYVLNO NO NOILWWYOS OVWOLOd 3HL 4O AYNSOdXA3 AIXX1 Td WIATX Hd VYSONOW AZAYNS 1V9ID01030 'S “N ff Ne Boar: | ) PIATS (aoe. 12 IG AN OE 1B, I DO WY Exposure on 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...........--.---.----------------------- Page. ‘0 ‘d ‘NOLONIHSVM ‘3NN3AV SVSNVM NO NOILVWHO4S OVWOLOd SHL JO AYNSOdXA AXX1 “1d INAIX Hd VYSONOW AJZAYNS WWOIDSO1035 ‘Ss ‘N GPA Wei PX ee Exposure on Sixteenth street, opposite Crescent street, Washington, D C., looking northeast, showing basal Potomac clays overlain by superficial deposits (compare section on page 386) .-.----------- Page. ‘O ‘d ‘NOLONIHSVM ‘LSSHLS HLN3SLXIS NO NOILVNYOS OVNOLOd SHL 3O 3YNSOdxa4 IAXX1 “1d IIIATX HdVHYSONOW ASAYNS WW9IN01039 °S “N Jeb AU ICIS) Wi OC WIC IE Exposures at Terra Cotta, D.C.,in the railroad cutting looking east, showing irregularly bedded Rappa- hannock sands inclosing clay Jenses. The two views overlap nearly half their width and represent about 100 feet from north to south, Fig. 1 being the more northerly......---.-.-.--------------- Page. U. S. GEOLOG ICAL SURVEY MONOGRAPH XLVIII PL. LXXVII EXPOSURES OF THE POTOMAC FORMATION AT TERRA COTTA, D. C, TEAR IO WOU AINE Ip) WO OWED AL Exposures at Freestone, Va., in railroad cutting, looking west.---..--.--.----------------+-------- 385 Fic. 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. Fic. 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 XLVIIl PL. LXXVIII EXPOSURES OF THE POTOMAC FORMATION AT FREESTONE, VA. ca as i ; i = co - JP JO AN IE 1, LI CIO Exposures on Back Lick Run 5 miles southwest of Alexandria, Va., looking east Fie. 1. Cross-bedded Rappahannock sands with lenses of green clay. Fie. 2. Pure white lenticularly bedded Rappahannock sands. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. LXXIX 2 EXPOSURES OF THE POTOMAC FORMATION ON BACK LICK RUN, VIRGINIA. De vie} ef; qe eae as 4 PAGES Toe ne] PAC ATID SE EXC? Map showing the distribution of the formations of the Potomac group in Maryland, the District of Page Columbia, and adjacent parts of Virginia, with indication, by numbers, of the localities at which fessils and other objects mentioned in the text have been found. .--.--.--...-..-.---.----------- 412 fs RL oh Sea level j 8 Sea level Section A-B Burtonsville to Devils Branch Section C-D erry Hill to Chesapeake and Delaware Canal iene ous BN JURASSIC(?) 3 Patapsco Arundel Patuxent cS o Fossil ete. localities . Other plant remains Grays HLL Shannon Win Malden Hill Foye Hill Abingdon Joppa Stemmons ttin © Fodonal Min Schoolhouse Will Timber Neck Contee Reform School, D.C, Overlook lon, D.C. Ft Washington MtVernonVa Tadinn Head LOOAT, COLUMNAR SECTIONS MONOGRAPH XLVI PLUXXX Seetion A-B Burtonsville to Devils Branch Section C-D LEGEND JURASSIC(?) Rarit) Patapseo Arundel tes x Cyea! 0 Fossil ete. localities -s Le YINVAIAEH Ee, MAP ae ANG THE AREAL DISTHIEMETTION ¢ sigs tp THE FORMATIONS on THe POTOMAC GROUP MARYLAND Hey ALCO UEETTE LESTE P ituxent : nis “cr plant rem ~ Uther |} Le I Eypee Ih Thy lp COG DOL MaryLanp Poromac Cycaps. Page. CYCADEOIDEA MARYLANDICA (Font.) Cap. & Solms. Side and base view of the Johns Hopkins Univer- sity Cycad, No. 1: also of silicified wood from the Potomac formation of Maryland, from a photo- PTEHOL ye SeMe aa Be AEE SAE co mane oe ne Suomen as se e=s353 cobs see encs cao asso or asks sasoanscS 419 (For historical account, see p. 410.) ‘GNVIAYVW SO NOILVWHOS OVNOLOd AHL WOYS GOOM GalsioMIs GNV ANNYL GVOAO AaAYNS 1VOIDO10359 *S “Nn IXXX17 1d IIATX Hd VYSONOW : ite ed De) eEXS XO XGINIE Je WAN IIH) Ib) COO IVIL MaryLtanp Potomac Cycaps. CycaDEOIDEA MARYLANDICcA (Font.) Cap. & Sclms. View of Johns Hopkins University Cycad, No. 2, from a photograph by Tyson (For historical account, see p. 410.) U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. LXXxXII fp ba el a BR CENTIMETERS TRUNK OF CYCAD EARLY DISCOVERED IN THE POTOMAC FORMATION OF MARYLAND. eA) EXC Xe XGIGINE IPD A J) Wb OX OOK TIL IE Maryitanp Poromac Cycaps. Page. Figs. 1-3. Group of cycads, from a photograph by Tyson (for historical account, see p. 414). F 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 Fie. 3. Cycaprorpsa Brssinst Ward, Johns Hopkins University Cyead, No. 4.......-.-.------- 458 Fic. 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 |e iad a L_IGENTIMETERS] TRUNKS OF CYCADS EARLY DISCOVERED IN THE POTOMAC FORMATION OF MARYLAND. JEL eI ILO ID, a TAG AUNT et ONG ONG DAN MaryLanp Poromac Cycaps. Group of cyeads in the museum of the Johns Hopkins University, Baltimore. Fies. 1,2. CycapromEA MARYLANDICA (Font.) Cap. & Solms. Page. Fig. 1. Side view of Johns Hopkins University Cycad, No. 5......--.----------------- 422 Fig. 2. Johns Hopkins University Cyead, No. 3___.--------------------------------- 423 Fig. 3. Cycapromwera Bresinst Ward, Johns Hopkins University Cycad, No. 4.-_--.-------- 458 “GNVIAYVW SO NOILVNYHOS OVNOLOd SHL NI GSYSAOOSIG ATYVA SAVOAOD 40 SANNYL Sua Laws c) eee AIXXX1 “1d IWIATX Hd VYSONOW AAAYNS 1V91I901039 ‘S *N IEEE) LOO ae EAR Pee GN GE MaryLANnpd Poromac Cycaps. CycapeoipEA Brspinst Ward. : Page. View of the external surface of the fragment sent by Philip Tyson to Sir William Dawson, known asthe Dawson Cycad? ss 0 sy 25 We he ke el Ae NU SRE ley a eg een aca ere 459 (For historical account see p. 409.) U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. LXXXV Ea ae ceNTIMETERS] TRUNK OF CYCAD EARLY DISCOVERED IN THE POTOMAC FORMATION OF MARYLAND. JEG IDID, XO OW TL 1 Tp IB I 2 OOK WIE MaryLtanp Poromac Cycabs. CycaDEOIDEA FonraIngEANA Ward. Page. View of the external surface of the South Carolina College Cyead.-.....-.--------------------- 442 (For historical account see p. 411.) U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. LXXXVI aa pun ee os REA CENTIMETERS TRUNK OF CYCAD EARLY DISCOVERED IN THE POTOMAC FORMATION OF MARYLAND. Tey Ibe oS OW ILE Fie. = Fie. Fic. Fre. Fie. lie. Fic. Fic. Fie. Vic. Fie. Fie. Fic. Fia. Fie. Fie. Fic. Fie. Fic. Fie. Fic. Ira. Fre. Fic. Fic. Fie. Fic. Fie. Fic. Fic. Fic. Fie. Fic. Fie. Fic. Fic. Fia. Fie. Fie. Fic. Fic. Fie. Fic. Fic. Fic. Fic. Fic. Fie. Fic. Fic. Fic. Fic. Fic. Fic. Fie. Fic. Fic. Fic. Fic. Fic. Fie. Fic. Fic. Fia. - The Turner trunk; No. 3046, Cycapromra Fonrarneana Ward . The Tubbs trunk; No. 1465, CycapromEA Brepinst Ward . The Wilson trunk; No. 1479, Cycapromra GoucuERrtana Ward . The Robinson trunk; No. 1487, Cycapromea Brssryst Ward . The Linthicum fragment; No. 1484, Cycaprorra Brepinst Ward . The Link trunk; No. 1481, CycADEOIEA MARYLANDICA (Font.) Cap. & Solms_--_.------ . The Dorsey trunk; No. 635 3, CycapEoDRA Bippinst Ward . The Reinsnyder trunk; No. 6344, CrcapEomEa MARYLANDICA (Font. ) Cap. & Solms-.--- - . The Helwig trunk; No. 3328, Cycapromra mARYLANDICA (Font.) Cap. & Solms________- _ The R. T. Donaldson fragment, No.3; No.3324, CycADEOIDEA MARYLANDICA (Font.)C.&S_ . The All-Saints trunk; No. 1466, Cycaproipea Brspinst Ward . The Gray trunk; No. 6354, Cycaprorpea Breprnst Ward.....--. 5... 0- 0s --.--22-2 +2 ee . The Smith trunk: No. 1482, CycapEowrA Bispinst Ward . The Smith fragment; No. 1483, Cycapromwra Bresiyst Ward . The Lester trunk; No. 3056, CycaDEOmEA MARYLANDICA (Font.) Cap. & Solms 2. The Griffith trunk; No. 1467, CycADEOIDEA FonTAINEANA Ward 3. The Clark trunk; Nos. 1659, 1659a, CycapEowEA McGrrana Ward . The Crook fragment; No. 1428, CyCADrowEA MARYLANDICA (Font.) Cap. & Solms-.---- - . The Carr tr unk: No. 1463, Cycapromra Brapinst Ward 3. The Noah Donaldson trunk; No. 1470, Cycapromra Fonraryeana Ward 7. The Welsh trunk; No. 1464, CycADEODRA Brssinst Ward 8. The Riddle fragment; No. 1488, CycapromEa FontTarnrana Ward . The Hegeman trunk; No 6345, Cycapsowea Fisunrx Ward, n. sp 0. The M. a Donaldson trunk; No. 1471, CycADEOIDEA McGErana Ward . The Comegys fragment; No. 1658, CycaproEa FonTarneana Ward 2. The Harman trunk; No. 1426, CyCADEOIDEA Brspinst Ward . The R. P. Disney fragment, No. 1; No. 3348, CycaprorpEA Brsepryst Ward_- . The R. P. Disney trunk, No. ile No. 6343, CyCADEOIDEA MARYLANDICA ae ) C. & Ss. 6. The Hing Feaarnents "No. 1480, ‘Cioaseowel Bresrvst Ward . The R. P _ Disney trunk, No. 2; No. 6352, Cycapromna FonTarneana Ward..-.--.----- . The Snowdon fragment; No. 305 4, CycADEOIDEA Bresinst Ward . The R. P. Disney fragment, No. 2: No. 6348, Cycapromra FonTAINEANA Ward . The Crook fre agment, ‘No. 2: No. 1429, CycaDEOmra Unierrt Ward . The Trayers fre agement; No. 1478, CycaprEorpEA Brepinst Ward JP Td) I OK WIE Maryutanp Poromac Cycaps. Group or Cycaps 1n THE Museum or THE WomAN’s CoLiecE or BauTrore. The Polly Jones trunk; No. 1427, Cycapromera Brspinst Ward..._-.-...-.----.------ The R. T. Donaldson trunk, No. 1; No. 1472, Cycaproipra TysoniaAna Ward The Weston trunk; No. 1468, CYCADEOIDEA Brsprnst AVVfair GL is CU at Ee leave aya) Seon The Dennis Butler trunk; No. 1462, Cycapromra Bispiyst Ward , 12. TheR.T. Donaldson fragment, No.6; No. 3341,Cycapromra MARYLANDICA (Font.)C.&S__ 4 Swope icre thas . The Deakins fragment; No. 3055, CycapEomEra McGrrana Ward . The Luther Welsh fragment; No. 3323, Cycapzomra McGrnana Ward . The Inglehart fragment; No. 6347, CycapromEa FonTaryeana Ward . The Magruder fre agment; No. 1489, CycapEomwera Fonrainrana Ward 2. The R. P. Disney ‘fragment: No. 6351, Cycapromra Brssryst Ward . The Emmons fragment: No. 3346, CycapEowEra FonTAINEANA Ward . The Odensoss f ragment; No. 3347, CycaDEOIDEA FonTrAINEANA Ward . The Simms fragment: No. 3047, CycADEOIDEA Brspinst Ward . The Anderson fragment; No. 6346, CycapromeEes Fontrainrana Ward . The D. O. Donaldson fragment; No. 1657, CycADEOIDEA MARYLANDICA (Font.) C.&8 - . The R. T. Donaldson fragment, No. 4; No. 3326, CycapEorDEA FonTarneANA Ward. ---- . The W. P. Disney fragment: No. 3349, Cycapromera McGrrana Ward.- . The White fragment; “No. 3068, Cycapromra McGrrana Ward . The R. T. Donaldson fragment, No, 1; No. 1473, Cyacproripra Fonraincana Ward ..-.. 3. The Tubbs fragment; No. 1192, CYCADEOIDEA MARYLANDICA (Font.) Cap. & Solms....-- - . The Morgan trunk; No. 3051, Cy CADEOIDEA MARYLANDICA (Font.) Cap. & Solms. - . The Inglehart fragment, No. 1; No. 3325, Cycapromra McGrrana Ward - The Cole fr: agment: No. 3122, @ycapgowEA FonTarnrana Ward : The Harrison fragment; No. 1486, CycapEomDEA MARYLANDICA (Font.) Cap. & Solms-- . TheR.T. Donaldson fragment, No.2; No.1656,CycADEOIDEA MARYLANDICA (Font. dons BS. . The Giles fragment; No. 3352, CycADEOmEA "T'YSONIANA Ward_. a . The Owens fragment: No. 3057, CycADEOIDEA MARYLANDICA (Pont. ) Cap. '& Solms. The R. P. Disney fragment, No. 3: No. 6350.CycADEOIDEA MARYLANDICA (Font.)C.&S-_- The R.T. Donaldson f fragment, No.7; No. 6349, CycADEOIDEA MARYLANDICA (Font.)C. &S.. Page. 443 460 452 460 433 460 460 460 461 423 461 424 424 424 456 462 462 462 424 443 435 425 463 443 464 443 471 435 444 464 464 425 425 465 444 465 444 454 466 426 427 427 436 444 427 428 433 428 428 428 436 436 444 445 466 445 445 466 445 429 445 437 437 445 NAXXX1 “Id “AYOWILIVE INATX HdVYSONOW dO 439371100 SiINVWOM SHL 430 WN3SNW S3HL NI SGVOAO 40 dnoYD ed AZAYNS 1VOINO103D ‘Ss “Nn Scar, A ek TP LAI, ILO OWE Pb NAD By 1) XC ON WoL ILL Marytanp PoromMac Cycaps. CyCADEOIDEA MARYLANDICA (Font.) Cap. & Solms. Page. View of the Link trunk, No. 1481, of the museum of the Woman’s College of Baltimore, restored to its place in the Link Gulch, near Arbutus, Maryland, also showing the exposure as seen from the Wwestisides lookimevacross) thie} oll Chiemsee eee ee eee ee 429 PL. LXXXVIII MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY IN PLACE. LINK GULCH WITH THE LINK CYCAD JID IL OOD Col = mew NM eK oe ok Ww JP 1b, ANSE 18) IL) SOX OK TO Maryitanp Poromac Cycaps. Groupe or Cycaps IN THE MUSEUM OF THE WoMAN’s CoLLEGE OF BALTIMORE. . The Whitehead trunk, No. 2; No. 9051, Cycaprorra FonraingANA Ward___...------- . The Whitehead trunk, No. 1; No. $050, CycapEorpEA CLarKIANA Ward n.sp----------- . The Dearstine trunk; No. $049, Cycaproipka GoucHERIANA Ward_..-.._-..---------- . The R. T. Donaldson trunk, No. 2; No. 9052, Cycaprorppa CLarKiANA Ward n. sp----- . The Travers trunk; No. 6356, CycADEOIDEA Brepinst, Ward..-.._..-..._._--____-.--- . The R. T. Donaldson fragment, No. 9; No. 9047, CycaproiprA McGrrana Ward...---- . The Marlowe fragment, No. 2; No. 9059, CycaproipkA Brepinst Ward... -----.----- . The Allen fragment, No. 1; No. $046, CycADEOIDEA MARYLANDICA (Font. ) Cap. & Solms-. . The R. T. Donaldson fragment, No. 14; No. 9058, CycapEOIDEA MARYLANDICA (Font. ) Cap. GEES OMMSS 2 oo oe II a ee A AIRS ANS AED se VO . The David Ring trunk; No. 6357, Crcaproipea Bippinst Ward.-.--.-----.----------- . The Allen fragment, No. 2; No. 9048, CycaproipEA Brppinst Ward..-...-.----.--.----- . The R. P. Disney fragment, No. 6; No. 6359, CycADEOIDEA MARYLANDICA (Font.) Cap. & Solis soe Se ease Ie ye Ee OI SA SUD RR et a a rR . The R. T. Donaldson fragment, No. 13; No. 9057,Cycapromra McGrrana Ward__----- . The R. T. Donaldson fragment, No. 10; No. 9053, CycaprorwEa Fonrainrana Ward_-- - . The R. P. Disney fragment, No. 5; No. 6358, CycaproipEA MARYLANDICA (Font.) Cap. & Solmse23 226 Yet ote a Lion Bo OE Cie ep eae al Sec Vet a Pa . The Marlowe fragment, No. 3; No. 9061, CycapEoIpEA Fonrainrana Ward.------------ . The Travers fragment, No. 2; No. 9060, Cycapeorpra McGrrana Ward._----------.--- . The R. T. Donaldson fragment, No. 17; No. 9065,CycapEOIDEA MARYLANDICA (Font.) Cap. (CSS) IO Sets Bye) Sera eee el sa ea Ee a NS Ss Sa SESS oes ces can ee ale ae avels ). The R. T. Donaldson fragment, No. 15; No. 9062, CycaprorpEa FonTAINEANA Ward... . The R. T. Donaldson fragment, No. 16; No. 9064, CycAprorprEa FonTaIngANA Ward... - . The R. T. Donaldson fragment, No. 8; No. 8319, CycADEOIDEA MARYLANDICA (Font.) Cap. fccoheTo) Vo siinen Ay EP AMR ASH Ge aeoR er Mane aE INR PAM ome a eo ao Se aS ke ok . The Marlowe fragment, No.1; No. 9055, Cycapgomra McGrrana Ward.-.------------ in, LO. rages Vl The R. T. Donaldson fragment, No. 11; No. 9054, CycaproipkA McGrrana WarD...-- - The R. T. Donaldson fragment, No. 12; No. 9056, CycapEompEA Fonrainrana Ward - -- “AYOWILIVE 43O 3947100 SiNVWOM 3HL 3O WNSSNW SHL NI SGVOAOD 3O dnoUuD [SusiSwiosG] XIXXX1 "Id IIIATX HdVYSONOW AJZAYNS IWOIDO103D 'S '"N ale ACME xc Cs Maryitanp Poromac Cycaps. The Link trunk, CycaADEOIDEA MARYLANDICA (Font.) Cap. & Solms, No. 1481 of the museum of the Woman's CollegeiofsBartimore:cs ance ce sae te see a ee See eee eee ee ere eee eae eta eee Page. ‘VOIGNVIAYVN VAGIOSZGVOAN SYSLIWILNS0 x lew ae ea | ] OX “Id IIIATX Hd VYDONOW AZAYNS 1VOIDO103D 'S “"N PAP AGA axe Calas MaryLanp Poromac CycaDs. Page. The Helwig trunk, Cycapromra MARYLANDICA (Font.) Cap. & Solms, No. 3328 of the museum of the Womans) Colle geyofs Ball tama ore eee ste 431 .S. I E— U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XC! See ae eae CENTIMETERS CYCADEOIDEA MARYLANDICA. ee. Ks Boe il i Jeb AI I OO ILM Marytanp Poromac Cycaps. Trunk, No. 1, of the museum of the Maryland Academy of Sciences, CyYcADEOIDEA MARYLANDICA (Font.) Cap. & Solms. Two views of opposite sides Page. VOIGNVIAYVN VACIOAGVOAD (S¥313wid30 HOX Id IIATX HdVYDONOW ASAYNS 1VOID01039 ‘Ss *N JIE ANE ID) DCO APIE IC Maryianp Poromac Cycaps. Page. The R. T. Donaldson trunk, No. 1, Cyrcapromwra Tysoniana Ward, No. 1472, of the Woman’s College of Baltimore -q/s 53s eee ee eR eS yp SN ee Lo pe 433 U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XCIII RES Sy] CENTIMETERS, CYCADEOIDEA TYSONIANA. IE IL IE I CCIE Maryianp Potomac Cycaps. CycapEomrA McGrrana Ward. 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._._._._---..------------------------------- Page. ‘“VNWSS9OW VAGIOSGVOAD SY3ZLIWILNIO Se AM9OX “Td WIATX HdVYSONOW AZAYNS 1VOINO103D ‘Ss “N ley oars 4.so mnyniien moh — y * : f Dorr IOAN a) ONE Maryitanp Poromac Cycaps. CyYCADEOIDEA 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 “VNVANIVLNOJ VWAGIOSGVOAO TEBEMERER GS el a | ADX “1d IIATX HdVYDONOW * ASAYNS 1V9IDO103D 'S “N Je IID, SG WI: Maryianp Potomac Cycaps. 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 “VNVANIVLNOA VAGIOSAGVOAD * = fre IADX “Td IIATX HdVYDONOW ASAYNS 1VOIN0103b *S "Nn DEI U AAD Iv OKO NE IE IE MaryLtanp Poromac Cycabs. CycapEoIDEA FonTAINEANA Ward. Page. Fic. 1. The Noah Donaldson trunk, No. 1470 of the Woman’s College of Baltimore ------------- 448 Fic. 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 Fic. 4. Interior view of the Magruder fragment, No. 1489 of the Woman’s College of Baltimore.. 449 Fic. 5. The Anderson fragment, No. 6346 of the Woman’s College of Baltimore.........-------- 450 “VNVANIVLNOS VACIOSGVOAD (SUS13WNS0 Ee ee] Sua l3aWiiN30 al Sl Ea eal a HWAOX “Id IIIATX Hdv¥YDONOW ASAYNS 1V91901039 °S "Nn by spire Seetalarer backs wine dT PAAR item nen ors iy LBs OO WUE Pl Aca xe Cay shies Marytanp Poromac Cycaps.. CycapEompEA Fonraringbana Ward. Page. Fic. 1. View from above of the R. P. Disney trunk, No. 2, being No. 6352 of the museum of the Woman’s College of Baltimore. ...-------------..---------=---------------------- 450 Die, D. Wao Or Wns OAc OH Wes SOM. oo So cess bose cc coos esse os secesoosse co cosu es onascar 450 U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XCVIII CENTIMETERS | aT CENTIMETERS CYCADEOIDEA FONTAINEANA. IED) ONIX. PENI IANG IE Vay, OCLC Marytanp Potomac Cyrcabs. CycaDEomEA GoucHERIANA Ward. Page. Side view of the Wilson trunk, No. 1479 of the museum of the Woman’s College of Baltimore.... 452 U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. XCIx (ERS ceNTme TERS] CYCADEOIDEA GOUCHERIANA, 12 Ib) BUI 1D), (G MaryLanp Poromac Cycaps. CycapEomEA Unrert Ward. Page. Side view of the Les trunk, No. 2 of the museum of the Maryland Academy of Sciences.......... 455 U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. C CYCADEOIDEA UHLERI. Gy AG Ese Ale MaryLanp Poromac Cycaps. CycapEoIDEA Brispinst Ward. Page. Side view of the Polly Jones trunk, No. 1427 of the museum of the Woman’s College of Baltimore. 468 MONOGRAPH XLVIII PL. Cl U. S. GEOLOGICAL SURVEY Pree CYCADEOIDEA BIBBINSI. V Ttatee nie bane Ee a tis eo Bs ee en! eres vs PGA WIG CII, Maryianp Poromac Oycaps. CycaprEorpEA Bresinst Ward. Page. Fia. 1. Side view of the Dennis Butler trunk, No. 1462 of the museum of the Woman’s College Of Baltimore 2 soe oa eae ca NENT OMI CB aU gra Ln Nay eet A cL pS 469 Fic. 2. Side view of the Tubbs trunk, No. 1465 of the museum of the Woman’s College of Balti- L100}: apenas Sierras Aan anita eM ey Sys a Ade MUNG MA ACNE Me As a bie on 469 MONOGRAPH XLVIII PL. Cll U. S. GEOLOGICAL SURVEY om} no a WwW = Ww = oO Ww {a} + CYCADEOIDEA BIBBINSI. elisa CIUOL Pac Acsatirey Culenlinlien MaryLanp Poromac Cycaps. CycapgeoweEA Brssinst Ward. View, natural size, of a radial section through the Smith fragment, No. 1483 of the museum of the Woman's! CollegeiofiBaltimores ssa e =a ae eee ne ee eee Page. U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII_ PL. Clll CYCADEOIDEA BIBBINSI. ‘ oe: Penne 1 lJ, CILW’. PalpAn eC alii MaryLAnp Poromac Cycaps. CycapEomeEA Bispinst Ward. Side view of the Gray trunk, No. 6354 of the museum of the Woman’s College of Baltimore PL. CIV MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY wn a w - w = = z WwW 6) - CYCADEOIDEA BIBBINSI. PLATE .CY. Maryianp Poromac Cycaps. CycapEorDEA FisHErx% Ward n. sp. Page. View of the external surface of the Hegeman trunk, No. 6345 of the museum of the Woman’s Col- lege‘of Baltimore fees fhe 24 Co oie 2 epee AY ye oe ras care eye eM eee el e e E EI ete 471 PL. CV MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY ao eT CENTIMETERS] CYCADEOIDEA FISHERA. i. eeSap Ov, |. 8 IP be IT (OWI MaryLanp Poromac Cycaps. CycaDEoIDEA CLARKIANA Ward n. sp. Page. View of the best preserved side of the Whitehead trunk, No. 9050 of the museum of the Woman’s College of Baltimore: sis spe aie NA Bs oy ere eaten EN gets Res gS Ree 473 PL. CVI MONOGRAPH XLVIII U. S. GEOLOGICAL SURVEY [RRILCENTIMETERS CYCADEOIDEA CLARKIANA. Dons Cal JP bp ae Ie Ih OWE FLora or THE Poromac FORMATION. Page. Bigs sBATEROPSIS) PEURIPAR DITA HOM Goesyes one eee ae ee eae ee Un oper lg 479 Ga 2s DLO ONUEES 93 U CHTAINTUS A (E1C Ee je EsO meet par cL 479 UT Grpeet see LUST SUM TAU AUR VRE G LINILC) Ag HI Us ERS [> tae a te SE ee 484 UG VVALIOTTAIVCS ONIAG 219 GIANLETE UNA'G BAW V(e01rCl nn ess Pee a Up 485 HIG On CY OADEOSEERMUNGEOBO VAI UNH] OT tape ppp ene esa oases aL ag gen 485 Fic. 6. ARavta ? VERNONENSIS Font. n. sp.__.......-.-------- Sei ee me Maes OA Se Na ees 492 HGS fon CHUASDR OPH YMG UME RIS ON TAN M Ga ic kee aes teee aan ee ee aie ean eu a ear 493 BGA S a PHEDRIDESH/ AVERNONIENS IS\0H O11 tenia S|) esate ee een 495 IMG, Ch FORUMOPENAguEN WoanUMOn WWerel Wo so. coo sosccassscancssncsscsesoceccsesbccences 499 HG OS SCLERORRERTS RVIERINONEN SSI V/a,C oe aes ae ea 501 Hic sala eAtmen tof ardicotyled onset onltese eee see eee ae te 515 U. S. GEOLOGICAL SURVEY MONOGRAPH XLVIII PL. CVII FOSSIL PLANTS FROM THE POTOMAC FORMATION OF VIRGINIA. ay ra sists Je seNIE I) (OWICUE IP Ibo Wh OW ILI I. FLorA OF THE Potomac ForRMATION. Fic. il, IDIGLONTANOS 1uCieawVNwIS (Biss) Bom 5 sesssesoske dn Lose sche sede bsasecdosesssscce Fic. 2° Droonrmes Buceranus! Agieninus (Gcpp ) Ward!_22 2222552222222 202 Fig. 35) CEVASDROPRENY IIS MaPATZ BD O MUS MV (S)0 CL TTNES |) Sees tte et eset ae ne Fic, 4. GLYPTOSTROBUS BROOKENSIS ANGUSTIFOLIUS (Font.) Kn.._.........-...-.-.---.----- Fig, O} ARISTOLO CHIP EYEE UM i CEIEL UT ARE VValG 1st Pas ae ees aie oped eal ee as Fic. GRICELASTROP EY LL UME MUN DE RTM Viens eye tee rea aaa eg Fig. 7. CELASTROPHYLLUM ? SALICIFORME Ward nD. sp._-..-----------------------+---------- Fie. 8. MY RIGA BROORENSTIS HOMES Yoyo aye aa Sh a ay) Ee NC ene a ne ey BGs OOM WEPTOSMROBUS {7s OVALS aV\/a00 Clan O Tris AI O viper aerate ee ee ? Fic. 11 Fig. 10. Enlargement of Fig. 9, x 2. 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