Category archives for Pioneer Mountains

Grasshopper Creek-Beaverhead River drainage divide area landform origins, southeast Pioneer Mountains region, Beaverhead County, Montana, USA

Abstract: This essay uses topographic map evidence to interpret landform origins in the southeast Pioneer Mountains region between Grasshopper Creek and Beaverhead River in Beaverhead County, Montana. The Beaverhead River is today a north-northeast oriented drainage route east of the Pioneer Mountains and is joined by the north, northeast, southeast, south, and northeast oriented Big […]