“…These strata thin to near zero from the Williston Basin into eastern and north-central Montana and thicken to 200 feet in west-central Montana and up to 800 feet in northwest Montana (Sandberg & Hammond, 1958). & Lopez, 1985;Nelson, 1995). Basement features include the Great Falls Tectonic Zone, Pendroy Fault Zone, Lewis and Clark Line, Scapegoat-Bannatyne Lineament, Wyoming Craton, Medicine Hat Block, Belt Basin, and Montana Aulacogen (Figure 10).…”