404 



INDEX. 



o. 



Oak Cliffs, 108. 

 Oatmanville, 134. 

 Ochre, 388. 

 Office work, xxviii. 

 OH, 100, 161, 216. 



section, 101. 

 Olenellus, 289. 

 Oligoclase, 388. 

 One Arm Creek, 68. 

 Onion Creek, 20. 



Ontarian System, 255, 267, 269, 274. 

 Onyx, Mexican, 162, 225. 

 Opal, 55, 259, 388. 

 Orange sands, 159. 

 Ord range, 233. 

 Ore, 65, 221, 223, 224. 



value of Texas, 223, 224. 



bean, 154. 

 Organization, Geological Survey of Texas, 



xvii. 

 Organ Mountains, 223, 232. 

 Origin of brown laminated ores, 72. 



conglomerate ore, 81, 82. 



nodular or geode ore, 79. 



white sandstone, 88. 

 Orthis, 247. 



Orthis highlandensis, 289. 

 Orthoceras, 244, 305. 

 Orthoceratites, 189. 

 Orthoclase, 259, 388. 

 Ostrea carinata, 128. 



georgiana, 58. 



quadriplicata, 130. 

 Owen, John, lxxiv. 

 Oyster beds, Laredo, 23, 44. 



Rio Grande section, 41, 43, 44, 46, 

 57. 



Pacific Railroad Survey, 186. 



epoch, 281. 

 Packsaddle Mountain, Ivii, 247, 248, 255, 

 268, 272, 276, 277, 278, 279, 281, 284, 

 285, 286, 291, 307, 308, 313, 346, 350, 

 359, 370, 372. 

 Packsand, 118. 

 Paisano Pass, 233. 

 Palgeophycus, 297. 

 Palafox section, 42. 



Paleozoic group, lx, 278, 283. *• 



Paleozoic region, Central Texas, 239, 250, 



251, 288. 

 Palestine, 33, 72, 100. 

 Palm Bluff, 53, 54. 



leaves, 54. 

 Palo Pinto County, lxvi. 

 Panola County, 72. 

 Paradoxides, 284, 289. 

 Paris, 109, 110. 

 Parry, C. C, 242. 



Parting, Cretaceous and Tertiary, 13. 

 Peak, Planner's, 326, 327, 328. 



Comanche, 120, 122, 123. 



Hill's, 326, 327. 



Kiowa, 196. 



Peak, Sierra Blanca, 222. 

 Pease mansion, 130. 

 Pebble beds, 59, 60. 



character of on Brazos, Colorado, 

 Rio Grande, 59, 60. 

 Pecan, 182. 



Bayou, 201, 205, 213. 



Creek, 332, 337, 338, 350, 364. 

 Pecos City, lxxiii, 232, 233. 



lxiii, River, 226, 232, 233, 234. 

 Pedernales River, 309. 

 Pegleg Crossing, 311. 

 Pegmatite, lvi. 

 Pena Colorado range, 233. 

 Penitentiary at Rusk, 65. 

 Penninite, 389. 



Penrose, R. A. F., Jr., xvii, xxiii, xxvi, lxxiv, 

 36. 



Report of, 3. 

 Permian Formation, lxix, 185. 



of Texas and its overlying beds, 183. 

 Personnel, lxxiv. 

 Peter's Creek, 299. 

 Petrified wood, 157. 

 Petroleum, xl. 

 Phillips Creek, 375, 

 Phillipsia, 311. 

 Phlogopite, 260, 389. 

 Piedras Negras, 40. 

 Pilot Knob, liv, 113, 125, 134. 

 Pinna, 155. 

 Pitchblende, 226. 

 Pitchstone, 226. 

 Plan of operations, xxiii. 

 Plateau gravel, 59. 

 Plant impressions, 53, 54. 

 Plants, Trans-Pecos Texas, 234. 

 Platyceras nebrascensis, 148. 

 Platyostoma, 305. 

 Pleurotomaria, 247. 



turbiniformis, 148. 

 Pcecillopoda, 289. 

 Point Isabel, 63. 

 Pond Creek, 20, 26. 

 Ponderosa marls, xlvi, 14, 15, 17 19, 20, 40, 



114. 

 Porphyries, 372. 

 Port Caddo, 89. 

 Port Hudson beds, 63. 

 Portland cement, liii, 114. 

 Post-Cretaceous deposits, 319. 

 P®st Oak Creek, 119, 155. 

 Post-Paleozoic uplifts, 311. 

 Post-Tertiary deposits, 58. 

 Pot holes, 262. 

 Potsdam epoch, 154, 289. 



flags, 290. 



limestone, 290. 



sandstone, 290. 

 Pottery clay, xli, 89. 

 Powell, J. W., xviii, xxvii, lxxv, lxxxix, 279, 



280. 

 Power, water, 174. 

 Prairies, Black, 107. 



Coast, 7, 63, 147. 



Fort Worth, 116. 



