Abstract
Foreland fold-and-thrust belts are found at the front of a mountain system where thick piles of sedimentary rock have been transported toward the continental interior along major thrust faults. The geometry of a thrust fault consists of a flat, which is nearly horizontal; a ramp that dips at angles between about 20 and 45 degrees; and an upper flat at the top of the ramp. The characteristic landscape is one of long linear mountains separated by linear valleys. In addition to the Valley and Ridge, this combination of rock type, rock structure, and resulting landscape is found in the Ouachita Mountains, the Marathon Basin region of West Texas, northern Montana- Idaho, and in an area known as the Idaho-Wyoming thrust belt west of the Wyoming Basin.
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