LISTS — GEOLOGIC FORMATIONS. 
305 
Paspotansa membor. Eocene, Maryland : 
Shattuck ct al., 2193. 
Patapsco formation, Cretaceous, Maryland: 
Clark and Mathews, 488; Shattuck et al., 
21!)::. 
Patapsco formation. Cretaceous, Maryland 
and Delaware: Miller, 1741). 
PatapSCO formation. Cretaceous. Virginia: 
Clark and Miller. 489. 
Patton shale, Mississippian, Pennsylvania : 
Butts, 368. 
1'aluxent formation, Jurassic?, Maryland: 
Clark and Mathews, 488. 
Patuxent formation, Jurassic?, Virginia: 
Clark and Miller, 489. 
Patuxent formation, Jurassic? and Cre- 
taceous. Maryland and District of Colum- 
bia : Shattuck et <il, 2193. 
Pawnee limestone, Pennsylvanian, Kansas: 
Sehrader and Haworth, 2144 ; Wooster, 
2636. 
Peachbottom slate, Algonkian, Maryland : 
Clark and Mathews, 488. 
Pearisburg limestone, Ordovician, Virginia: 
Bassler, 158. 
Pecosian series. Pliocene, New Mexico: 
Keyes, 1390. 
Pee Doe marl, Miocene, South Carolina : 
Sloan, 2218. 
Peekskill granite, Ordovician, New York: 
Berkey, 207. 
1'elliain (Trenton) limestone, Ordovician, 
Alabama : Smith, 222!). 
Fella beds. Mississippian, Iowa: Beyer and 
Williams, 234. 
Telly gneisses, Alaska : Brooks, 313. 
Pefia Blanca marls, Oligocene : Howe, 1244. 
Pennington shale, Carboniferous, Virginia: 
Bassler, 158. 
Penobscol formation, Cambrian : Smith et 
at. 2241. 
Peorian, Quaternary, Iowa : Calvin. 387. 
l'erclia shale, Devonian, New Mexico: 
Gordon, 981. 
Perry beds, Devonian, Canada: Ells, 784. 
rerryville, Ordovician, Kentucky: Miller, 
1748. 
Peshastin formation, pre-Tertiary, Wash- 
ington : Smith and Calkins, 2210. 
Piercefield gneiss. New York: Gushing, 014. 
Pierre formation. Cretaceous, Canada: 
Dowling. 735. 
Pierre shale. Cretaceous, Colorado: Darton, 
648; Fisher, 869. 
Pierre shale. Cretaceous, North Dakota : 
Leonard, 1560, 1563. 
Pierre shale. Cretaceous, Nebraska : Condra, 
.")70. 
Pierre shale, Cretaceous, Wyoming: Darton, 
642, (111 f,17; Darton and O'Harra, 656; 
Fisher, XT.'!. 
Pierre shales. Cretaceous, Montana: Brown, 
325 : Leonard, 1564. 
Fikes Peak granite. Colorado: Graton, 
1026. 
Pilgrim limestone, Devono-Silurian. Mon- 
tana : Fmmons, 806. 
6G836— Hull. 372-09 20 
Piney formation, Cretaceous, Wyoming: 
Darton, <>44-047. 
Piqua limestone, Pennsylvanian, Kansas: 
Sehrader and Haworth, 2144; Wooster, 
2636. 
Piscataway member. Eocene, Maryland: 
Shattuck et <iL, 2193. 
Pit formation, Triassic, California: Filler, 
721. 
Pitkin limestone, Mississippian, Arkansas: 
Purdue, 1971. 
Pitkin limestone, Mississippian, Indian 
Territory : Taff, 2332. 
Pittsburg limestone, Carboniferous, Penn- 
sylvania : Stevenson, 2294 ; Woolsey, 
2634. 
Pittsburg limestones, Carboniferous, West 
Virginia : (jrimsley, 1044, 1046. 
Pittsburg red shales, Carboniferous, West 
Virginia: (Jrimsley, 1044, 1046. 
Pittsburg sandstone. Carboniferous. Ap- 
palachian region : Stevenson, 2295. 
Pittsburg sandstone, Carboniferous, Penn- 
sylvania : Clapp, 475. 
Pittsburg sandstone, Carboniferous, West 
Virginia : Grimsley, 1046. 
Pittsford shale, Silurian, Now Vork : Hart- 
nagel, 1085. 
Plainfield quartz schist, Connecticut: Greg- 
ory, 10M4 ; Gregory and Robinson, 1038. 
Platteville formation, Ordovician, Iowa: 
Burchard, .'!">.;. 
Platteville limestone, Ordovician, Iowa : 
Calvin, 887, .".88. 
Platteville limestone, Ordovician, upper 
Mississippi Valley : Bain, 99 ; Sardeson, 
2 1 22. 
Platteville (Trenton), Ordovician, Missis 
sippi Valley : Davis, 663, 
Platteville limestone, Ordovician, Wiscon 
sin: Grant, 1017; Grant and Burchard, 
1021. 
Platteville stage, Ordovician, Iowa: Beyer 
and Williams, 234. 
Plattin limestone, Ordovician, Illinois: 
Weller, 2523. 
Pleasonton beds. Carboniferous, Kansas: 
Wooster, 2636. 
Pleasonton shale, Pennsylvanian, Missouri : 
Shepard, 2194. 
Plum Creek clay, Silurian, Kentucky : 
Foerste, 883, 884. 
Plum Point marls, Miocene, Maryland : 
Shattuck et al, 2193. 
Plum Point marls, Tertiary, Maryland: 
Shattuck, 2185. 
Pocono formation. Carboniferous, Pennsyl- 
vania: Butts, 368; Clapp. 47r>. 477. 
Pocono sandstone. Lower Carboniferous, 
Pennsylvania : Barrell, 150. 
Tocono sandstone. Carboniferous, West Vir- 
ginia : (Jrimsley, 1044. 
Pocono formation, Mississippian, Maryland: 
Clark and Mathews. 488. 
Pogonip limestone, Ordovician, California 
and Nevada : Ball, 120. 
