Plant species of concern and plant associations of Powder River county, Montana E1C3380F-9100-4DF5-BBE8-6E6321664192 Year: 2002 Figure 2. Powder River County Sliidy Area BLM USPS State trust fands Tribal & Allotted Other private Water 0 10 Scale in Miles MTNHP April 20, 2001 Geology and Soils The sweeping, luiglaciated landscape of Powder River County is carved by erosion largely from the Fort Union Fomiation, a heterogeneous Paleocene sedimentaiy deposit made up of sandstone, shale, ben- tonite, lignite and otlier materials. It is dissected by Quaternary alluvial deposits along major ri
Plant species of concern and plant associations of Powder River county, Montana E1C3380F-9100-4DF5-BBE8-6E6321664192 Year: 2002 Figure 2. Powder River County Sliidy Area BLM USPS State trust fands Tribal & Allotted Other private Water 0 10 Scale in Miles MTNHP April 20, 2001 Geology and Soils The sweeping, luiglaciated landscape of Powder River County is carved by erosion largely from the Fort Union Fomiation, a heterogeneous Paleocene sedimentaiy deposit made up of sandstone, shale, ben- tonite, lignite and otlier materials. It is dissected by Quaternary alluvial deposits along major rivers and tributaries. The county lies entiiely widiin tlie unglaciated segment of the Great Plains biogeographic province, and largely within the Powder River Basin section. Along tlie eastern side of the county, tlie Foit Union fomiation gives way to shales and claystones of tlie Piene Shale Plains section. Soils tluoughout die county are entisols and aridisols (Torriorthents and Camborthids) of dissected to nearly level sedimentaiy bedrock plains and hills. In addition, Ustorthents and Argiborolls occur in the pinelands, and Tonifluvents, Torrioitlients and Camboitliids in die broadest river valleys (Montague et al. 1982). It is easiest to visualize tlie terrain and associated soils tluough schematic diagrams. The rela-
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