MIDDLE TRIASSIC PTERIOMORPHIAN BIVALVIA (MOLLUSCA) FROM THE NEW PASS RANGE, WEST-CENTRAL NEVADA: SYSTEMATICS, BIOSTRATIGRAPHY, PALEOECOLOGY, AND PALEOBIOGEOGRAPHY

The parautochthonous Anisian and Ladinian rocks of the New Pass Range previously referred to as the Augusta Mountain Formation have a unique, endemic assemblage of pteriomorphian bivalves with Triassic Northern Hemisphere biogeographic relationships, especially to the Carnian cratonal faunas of northeastern British Columbia as well as to Ladinian faunas of the Shoshone Mountains and the Gillis Range. A new suborder Prospondyloidina is described,...