- GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Approximately 600 specimens of arenaceous foraminifera have been recovered from insoluble residues of limestones from the Lower Triassic Thaynes Formation in southeastern Idaho and western Wyoming. Most of the ten species, four of which are new, belong to genera which are far-ranging in age. This is the second reported occurrence of foraminifera from the Lower Triassic in the western hemisphere.