MLRA 58A - Northern Rolling High Plains, Northern Part Montana and Wyoming 105,620 km2 (40,780 mi2)

Soils:
Most of the soils are Orthents, Orthids, Argids, Borolls, and Fluvents. They are medium textured to fine textured, shallow to deep, and mainly well drained. Most of these soils have a frigid temperature regime, but soils in some wide river valleys, such as the Yellowstone River Valley, have a mesic temperature regime. The nearly level to steep Torriorthents (Lisam, Cabbart, and Lambeth series), Camborthids (Yamac, Lonna, and Cambeth series), Calciorthids (Crago and Cargill series), Haplargids (Bonfri series), Natrargids (Absher series), and Argiborolls (Tanna, Ethridge, and Evanston series) are on sedimentary uplands, fans, terraces, and foot slopes. The nearly level Torrifluvents (Havre and Glendive series) are on flood plains and low stream terraces.

12/16/98