Document Type

Grand Teton National Park Report

First Page


Last Page



Stratigraphic distributions and geographic variation of small mammals, principally Miocene in age, are being studied. The aim is to help construct a biostratigraphic framework that covers the north-central Rockies, as well as to clarify the importance of large mountain ranges as biogeographic barriers for small mammals. Principal goals of the 1981 field season, which was part of a longer-term project (Barnosky, 1980), included detailed measurement of stratigraphic sections and collection of Neogene mammals in Jackson Hole, Wyoming. A secondary goal was field study of Tertiary sediments in nearby intermontane basins in order to understand the regional character of sedimentation.