612 



INDEX. 



Potomac formation, naming of 362 



occurrence of 356 



plates showing LXXI V-LXXIX 



region of, map of PI. LXXX 



silicified lignite and wood in 362 



stratigraphy of 377-379, 478 



study of, history of 342-403 



See also Potomac group; Older Potomac formatioji. 

 Potomac formation, Lower. See Older Potomac. 

 Potomac formation in Maryland and Virginia, com- 

 parison of 575 



Potomac group, taxonomy of . - 412 



Potomac River, reconnaissance of 361 



Powell, J. W., Shinarump formation named and de- 

 scribed by 17 



Priconodon, 392 



Proctor Creek, Va., stratigraphy of 3S0 



ProteEephyllum Fontaine 219, 267 



callfornicum Font 267,271: PI. LXIX, Fig.ll 



den tatum Font 557, 



559, 363-564, 569, 594, 586; PI. CXVIII, Figs. 3, 4 



oblongifolium Fon t 538, 543, 586, 594 



ovatum Font 510, 538, 586 



reniforme Fon t 491, 586 



Uhleri Font 557, 



564-565, 586, 594-595; PI. CXVIIf, Fig. 5 



Proteacese 267 



Proteales 267 



Pryor, B. P., information from 273,274 



Pseudofrenelopsis Nathorst 176 



Feli.Kl Nath 340,579 



Pteridophyta 54-88, 1.53-165, 224-243, 286-303 



Pteris Albertsii (Dunk.) Heer 219-220 



frigida Heer 69,220 



haiburneJisis (L. & H. ) Ett 71 



insignis (L. & H.) Ett 69 



ligata (Phill.) Ett 69 



longipeimis Heer 69 



Pterophyllum Brongniart 97-104, 254-255 



abietinuvi Gopp 250 



eequale (Brongn.) Nath 99, 



100-101, 118, 140, 144; PI. XX 



Eequale rectangulare Nath 100 



alasken.se Font 152; PI. XXXVIII, Figs. 19. 20 



Braunsii Schenk 522 



Brongniarti Jlorr ; 2.52-253 



Buchianimi Ett 244, 249 



califomienni Font 252-253 



CL.nptum (Phill.) L. & H 94-95 



concinnum Heer 252-253 



contiguum Schenk 99, 140, 143; PI. XIX, Figs. 7-11 



? ctenif orme Nath 110 



dubiuin Brongn 100 



Diinkei'ianuin Gopp 243-244 



falcatum (L. & H.) Sandb 113 



Helmersenianum Heer 94 



Jsegeri Brongn 101 



? lowryanum Ward 254-255, 271; PI. LXVII, Fig. 9 



Lyellianum Dunk 256, 308 



Medlicottianum Oldh. & Slorr 522 



minus Brongn.? 104, 140141; PI. XXI, Figs. 8, 9 



Morrisianum Oldh. & Morr 522 



Nathorsti Schenk 97-99, 



100, 104, 140, 143; PI. XIX, Figs. 1-6 



Nilsoni L. & H 104 



peeten (Phill.) L. & H 98 



Page. 



Pterophyllum princeps Oldh. .t Morr 522 



rajmahal ense Mor 99, 



100, 102-104, 140, 142, 144, 152: PI. XXI. Figs. 1-7 



rigidum Phill 110 



saxonicum Reich 245 



schaumburgerise Dunk 303, 304 



Sensinovianum Heer 102-103 



Williamsonis Brongn 94 



Pterozamites comptus CPbill.) Schimp 95 



major (L. & H.) Fr. Br 79 



I'ittnitis (Brongn.) Fr. Br 81 



Plilophyllum sequale (Brongn.) Morr 100 



Ptilozamites Nathorst 89-90 



Leckenbyi (Bean) Nath 89-90, 



140, 143; PI. XVI, Figs. 1,2 

 Q. 



Queen Charlotte Islands, fossil plants from L'l^S-ilO 



geology of 210 



Queens Chapel road, D. C, fossil plantsfrom. 475, 527, 5s,3-589 



Quercophyllum chinkapinense Ward 510, 



513, 586; PI. CXII, Figs. 3, 4 

 tenuinerve Font 521, 526, 5.'6, 594 



R. 



Ranales 268 



Rappahannock formation, age and correlation of. 381, 403, 575 



fossils from 380, 478 



identity of James River formation and 478 



occurrence of 387 



Rappahannock River, section of 376 



Raritan formation, correlation of 356, 398, 576, .598 



occurreuce of 575 



Rauff, Hermann, Goniolina discussed by 336-337 



Red Butte, Arizona, Mesozoic rocks at 17,22 



petrified wood from 36 



section of 43, 44 



transition beds at 22,29 



Red Canyon Creek, section at 323-324 



Redwater Creek, stratigraphy of 380 



Reservoir, Washington, D. C, fossil plantsfrom 380, 



475, 516-519, 583-589 



Resin, fossil secretions of 34-36 



Reynold's ore pit, fossil plants from 544, 5S3-589 



Rhetic of Sweden, fossil plants from 100 



Rhodomelacete 154 



Rhodymeniales 154 



Rice, Claude, Jurassic plants collected by ;)2,217 



Richardson, James, fossil beds discovered by 209 



Richmond, Fredericksburg & Potomac R. R., 72d mile- 

 post on, fossil plants from 480^81,582-589 



Riddles, Oreg., fossil plants from 212-213,217,223,234,237 



Riverdale, Md., fossil plants from 475,533,583-589 



Roemer, Ferdinand, on Texas fossils 327-328 



Rogers, W. B., on Potomac formation 346-317,352-354 



Kogersia angustifolia Font .. 491,494,510,521,523,526,586,594 



angustifolia parva Font 521, 



523, 526,586,594-595; PI. CXI, Fig. 9 



longifolia Font 238, 



511,521,523-524,526,538,586; PI. CXII. Fig. 9 

 RoUand, Mr. and Mrs. J. H., fossil trunk collected by. 146 



Resales 269-270 



Rosiers Bluff, Maryland, fossil plants from 372-374, 



475, 527-533, 583-589 



Ruffordia Seward 75-76 



Goepperti (Dunker) Sew. 75-76,140,143; Pl.XII, Figs. 4-8 



