The western limit of the belt of Lara-mide thrusting in northwestern Montana is delineated by the Lewis-Eldorado-Lombard thrust faults. Within the Sheep Creek 7½-min quadrangle, the tectonic style of this belt changes from a moderately dipping zone of imbricated thrusts in the northwest corner to a single, nearly flat-lying thrust at the eastern margin of the quadrangle. This change probably reflects foreland buttressing at the northwestern edge of the central Montana trough.

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