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abundant auricle Aviculopecten beaks Bear Lake County beds bivalved specimen bivalves brachiopods brown brownish gray Bull Lake C. C. Branson calcareous Calcisiltite Caribou County Catalogued Specimens chert Ciriacks Claraia zone concentric fila configuration contains convexity County Creek Cyrtorostra dark gray dentition Dinwoody Dinwoody formation Discussion dorsal Edmondia Eotriassic Ervay member Eumorphotis fauna figs fossils Franson member Fremont County genera genus Geol Girty Grandeur member Gros Ventre Gros Ventre Canyon Guadalupian hinge holotype Hypotypes Idaho lectotype Left internal mold left valve Meade Peak member Middle Rockies Montana montpelierensis Mudstone Myalina Newell and Kummel Nuculopsis Occurrence paratype Park City Permian Permian-Triassic Permophorus phosphatic Phosphoria formation Plate poorly preserved posterior quartz quartzose relatively Retort member right valve Schizodus sect shale Shedhorn shell body silicified similar slightly species stratigraphic Streblochondria thin-bedded topoparatype Tosi member umbonal Unionites ventral margin weathers light weathers mottled West Texas Wind River Wind River Mountains Wyoming