Geologic cross-section of Heart Mountain Detachment along line A-A’. Fault lies atop Paleozoic carbonate rocks northwest of Dead Indian Pass, where it cuts across them (“ramp” shown on Figure 1). Southeast of Dead Indian, the detachment places Paleozoic carbonate rocks atop younger Mesozoic and Tertiary shales and sandstones of the Bighorn Basin. Carbonate rocks at McCulloch Peaks (MP on section) must have traveled at least 42 km in the direction of this section, which is roughly parallel to movement direction based on kinematic indicators in and above the fault zone. CC= Cooke City; J = Jim Smith Creek; WM White Mountain; DI = Dead Indian Pass; HM = Heart Mountain; MP = McCulloch Peak.
Originally uploaded in Integrating Research and Education:Montana Geoheritage Project:Montana Geoheritage Sites.
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