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Montana Central Grasslands

Ecoregion on Great Plains in MT, WY

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The Central Grassland ecoregion is an unglaciated plain that is dissected by many small, ephemeral or intermittent streams. It is largely underlain by noncarbonate, fine- grained sedimentary rock of the Tertiary Fort Union Formation which become less widespread in the neighboring, but less dissected, Ecoregion 43e. Clayey frigid soils derived from residuum are common and have a ustic-aridic moisture regime; they contrast with the mesic soils of Ecoregion 43q and the less aridic soils of Ecoregion 43a. Potential natural vegetation is grama- needlegrass-wheatgrass and is distinct from that of the Sagebrush Steppe (43e) and Pine Scoria Hills (43p). Ecoregion 43n is mostly rangeland but irrigated and unirrigated farms occur in the Yellowstone Valley. Overall, farm land is less common than in the Judith Basin Grassland (43m).

— EPA

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Ecoregion