physiographic provinces, of Texas: 35-37 physiography, definition: 35 of Texas: 35-37 phytosaurs: 42, 91, 94, 95 pick, mineralogist’s or prospector’s: 17, 18 pigs: 106 _Pinna_: 67 Pisces: 86-89 _Pitar_: 72 Placodermi: 87 placoderms: 87, 88 plant kingdom: 44 plants, classification: 44 Pennsylvanian: 46, 47, 48 _Platyceras_: 62 Pleistocene: 43. _See also_ Quaternary. fossils: 101, 102, 103, 104 plesiosaurs: 91, 93, 95 _Pleurocora_: 53 _Plicatula_: 68, 74 _Pliohippus_: 103 Poland: 7, 106 pollen: 47 polyp, coral: 49 _Polypora_: 55 _ponderosa, Exogyra_: 70 Porifera: 49 _Porodiscus_: 49 portland cement: 19 Precambrian— definition: 34 fossils: 40 of El Paso region: 40 of Llano uplift: 37, 40 of Van Horn uplift: 40 rocks of Texas: 40 Presidio County: 35 Proboscidea: 102 proboscideans: 102, 104, 107 teeth: 104 _proliferum, Lophophyllidium_: 52 _Prorichthofenia permiana_: 12, 13 Proterozoic, derivation and pronunciation: 33 Protista: 47 _Protocardia_: 68 _Protoceratops_: 90 Protozoa: 47, 49 protozoans: 47 pseudofossils: 14 _Pseudoliva_: 63 _Psilophyton_: 48 _Pteranodon_: 91, 94 Pterodactyloids: 91 pterosaurs: 91, 94, 95 _Punctospirifer_: 57 pyrite: 11 “Pyrite Fossil Zone” of Cretaceous: 11 Q _quadriplicata, Ostrea_: 71 quarries: 19 Quaternary— derivation and pronunciation: 34 fossils: 43, 101, 102, 103, 104 of Edwards Plateau, Gulf Coast, High Plains, North-Central Plains, and Trans-Pecos Texas: 43 quicksand: 5 R _radicosum, Lophophyllidium_: 53 Radiolaria: 47 radiolarians: 47, 49 Rancho La Brea tar pit: 5 rays: 87 Reagan County: 42 _Receptaculites_: 50 Renaissance: 3 Reptilia: 89-100 reptiles: 89-100 rhamphorhynchoids: 91 _Rhamphorhynchus_: 91, 94 rhinoceroses: 7, 104, 106, 107 woolly: 106, 107 _Rhipodomella_: 55 _Rhombopora_: 51, 55 Rice University: 27 Rio Grande valley, of Trans-Pecos: 35, 95 road metal: 19 _Robulus_: 49 Rock and Mineral Clubs: 23 rock units: 34 _rockymontanus, Spirifer_: 58 Rodda, Peter U.: 1 rudistids: 26, 27, 28, 29, 30 Rugosa: 51