The holotype specimen of Acristavus, MOR 1155, was recovered at the Two Medicine Formation, in Teton County, Montana.
Individuals living, working, or attending school in the following Montana counties are eligible for Russell county FCU membership: Cascade County, Montana, Teton County, Montana, Chouteau County, Montana.
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It rises in the Lewis and Clark National Forest at the continental divide in northwestern Teton County and flows northwest down from the mountains, past Dupuyer, and joins Birch Creek in Pondera County 2 mi (3.2 km) west of Valier.
Fremont County borders two such pairs of counties-- Madison County, Idaho and Madison County, Montana and Teton County, Idaho and Teton County, Wyoming.