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Tertiary strata exposed in four high elevation areas in the south-central Gravelly Range yield significant assemblages of Late Eocene to Oligocene mammals. The thickest stratigraphic sections of Tertiary strata are in the Lion Mountain-Black Butte area. The Lion Mountain section age is based primarily on American Museum of Natural History collections; the lower part of this section is Duchesnean-Chadronian (39-33 Ma) and the uppermost beds are Whitneyan (32-31 Ma). Age of the basal part of the Black Butte section is Duchesnean-Chadronian based on Harvard Museum of Comparative Zoology collections. Recent collections that include Miohippus indicate a probable Orellan age for uppermost exposures. The Tepee Mountain section is notable for abundant brontothere remains and is probably Duchesnean-Chadronian (approx. 39-33 Ma). The Rapamys site is the oldest vertebrate locality and is late Uintan to early Duchesnean (42-38 Ma) based on recently recovered specimens of Rapamys, Protoreodon, and Lycophocyon.

VERTEBRATE PALEONTOLOGY AND GEOLOGY OF HIGH ELEVATION TERTIARY DEPOSITS IN THE GRAVELLY RANGE, SOUTHWESTERN MONTANA