INDEX. 



611 



Page, 



Pecopteris haiburnensis L. & H 71-72 



IluUoni (Dunk.) Brongn 161 



imignu'L.&B. 68,70 



WjaiaVhiVi 68 



longifolia Phill 85 



microdonta Font 281 



' montanensis Font '. ... 281 



Murrayana Brongn 61 



obtusi/oiia (Murr.) L. & H 74 



paucifolia Phill 85 



Phillipsii Brongn 68 



Pingelii Schouw 61 



polydactyla Gopp 230 



polymorpha Dunk - - 228 



slridinervis Font 158-159, 229, 231-232, 540 



tenuis Schouw 68 



«MriaKsL. &H 68,70 



Ungeri Dunk 228 



virginiensis Font 348, 



480,538,548,552-553,586; PI. CXVI, Figs. 3, 4 



whitbiensis Brongn 67-68 



Williamsonis Brongn 68 



Pectinizamites Fontaine 310 



Penhallow, D. P., fos-sil fern described and figured by. 210 



Pennsylvania, fossil plants rrom 169 



Potomac formation in 379, 392-393 



Permian rocks, fossil plants from 169 



Petersburg belt, correlation of 3.54-355 



Petrified Forest, Ariz., buttes in, occurrence and char- 

 acter of 25 



conditions in 31 



petrified wood from 30-36 



rocks in 20, 21, 25, 27, 43 



section through 42-43 



Petrified wood, occurrence and character of 15, 



30-37. 214, 326-327, 343-344 



occurrence of, in place 33-34 



Pettyjohn's ranch, Cal., fossil plants near 211, 



214, 217-220, 232 



PlUebopteris i undans (L. &H.) Brongn 68 



Phoenicopsis Heer 128-129 



speciosa Heer 128 



?.sp. Font 128-1-29, 141; PI. XXXIV, Figs. 13, 14 



Fhyllites scitamineteformis Sternb 81 



Phyllopleris Pit illipsii Brongn 86 



Phytolithus 137 



Piceaexcelsa (Poir.) Link 531, .549 



Piceites exogyms (Corda) Gopp 263 



Piedmont, S. Dak., section near 318 



Pinacea 131-135,260-205,312-313 



Finales 129-13.5, 171-173, 258-265, 31 1-312 



Pinites 327 



exogyrus (Corda) Endl 203 



Leei Font 570, 586, .595; PI. CXIX. Figs. 6. 7 



Pink Cliffs, Ariz 42, 43 



Hnus Linnaius 131-132, 262-263 



anthraciticus Dn 281 



exogyra Corda 263 



Nordenskioldi Heer 13I-1S2, 



141-143, 281, 514, 586; PI. XXXV, Figs. 10-17 

 schistaWard.. 497^98,528,531,586; PI. CXII, Figs. 13-15 



sha.stensis Font 262-263, 272; PI. LXIX, Figs. 1-3 



staratsckini Heer 158, 160 



susquaensis Dn 281 



vemonen.sis Ward.. 491, 497-498, 586: PI. CIX, Fig>^.4-6 

 Pitch, fossil secretions of '. 34-36 



Plantaginopsis Fontaine 561-563 



marylandica Font 557, 561-563, .569,586,594, 



595; PI. CXVII, Fig. 7; PI. CXVIII, Figs. 1, 2 



Plantago virginica L 5C3 



Plaster Bluff, Ark., fossil plants from 332-333 



Platypterygium Balli Feistm 522 



denslnerve Font.? . 521-522, 523, 526, .586; PI. CXII, Fig. 8 



Rogersianum Font 523 



Pleuroccelus 392 



Plum Creek, Md.. fossil plants from 572 



Podozamites Friedrich Braun 108-112, 16.5-167 



dManalatiJolius (Fr. Br.) Schimp U2 



dietansminor (Schenk) Schimp Ill 



distantinervis Font 165-166, 



17.3-174 , 281 , 479, 516, 573, 586 



Emmonsii Newb 202 



grandifolius Font 166, 



167, 17:*-174, 202, 2.55, 281, .586; PI. XLIV, Fig. 1 



lanceolatus (L.&H.) Fr. Br , 110-111, 



140, 143, 202; PI. XXIV, Figs. 17-20 



lanceolatus Eichwaldi (Schimp.) Heer 143,166 



lanceolatus genuinus Heer 110, 142 



lanceolatus latifolius (Fr. Br.) Heer 112, 



140, 142, 143, 166, 202; PI. XXV, Figs. 5-7 



lanceolatus minor (Schenk) Heer Ill, 



140, 142, 150; PI. XXV, Figs. 1-1 



latipennis Heer 165,172,281 



minor (Schenk) Heer?... 1.50; PI. XXXVIII, Figs. 11, 12 



nervosa Newb 281 



obtiisifolius Heer 110 



pachynervis Font 112,140; Pl.XXV,Fig.8 



pachyphyllus Font.. 109-110, 140; PI. XXIV, Figs. 11-16 



pedicellatus Font 528, .332, 586; Pl.CXIV,Fig.l 



pulchellus Heer.. 108-109,140,143; PI. XXIV, Figs. 1-10 



Pohick Creek, Va., fossils from 487 



Pollard, Charles Louis, fossil plants collected by 491 



Polypodiacea; 63-83, 1.5.5-165, 22.5-229, 291-298 



Polypodiles undans (L. & H.) Gopp 69 



Polypodium Linnaeus 63 



oregonense Font 63-66,140; 



PI. VIII, Figs. 12-15; PI. IX; PI. X, Figs. 1-7 



Polyslichiles ilnrrayana (Brongn.) Presl 62 



Poplar Point, Md., fossil plants from 573,583-589 



Populophyllum menispermoides Ward 491 , 



498-499, 586; PI. CX, Figs. 2-1 



minutumWard 491,499, 



528, 532, 586; PI. CVII, Fig. 9; PI. CXIV, Fig. 1 



reniforme Font 499 



Populus Linneeus 266,508,569 



auriculata Ward 491,499-500,586; PI. CX, Fig. 5 



potomacensis Ward? 491, 499, 500, 532, 586, .598 



?PviceiFont 251,266; PI. LXIX, Fig. 10 



Porocystis pruniformi;* Crag 336 



Port Orford quadrangle, fossils from 146 



Potamogetophyllum Fontaine 500-501 



yernonense Font 491,500-501,586; PI. CIX,Fig.7 



Potomac beds, fossil plants from 167, 361, 362 



Potomac Creek, section on 377 



Potomac formation, age of .. 357,363,367-369,393,400-401,576 



character of 35.5,363,377-379,383-386 



columnar section of 597-599 



diagram showing 598 



correlation of 368,.5S0-599 



division of 575 



extent of 344 



fossils of .342-599; Pis. LXXXI-CXIX 



