All of the Oligocene vertebrate fossils on this list are from the White
River Formation (30-36 million years old) and have been collected from
deeded lands in Converse County, Wyoming. Written collecting permits
from the private landowner are available for inspection. All specimens
with Douglas Fossils collection numbers (e.g. DF0100) have precise
stratigraphic and locality data recorded in Douglas Fossil's files.
Copies of the stratigraphic and locality data can be obtained by