Geologic map and coal sections of the Forks Ranch quadrangle, Big Horn County, Montana
The Forks Ranch quadrangle lies on the gently-dipping east flank of the Powder River basin, near its trough line.
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The Forks Ranch quadrangle lies on the gently-dipping east flank of the Powder River basin, near its trough line.
The Honaker quadrangle lies in two physiographic provinces. The northern half of the quadrangle is part of the Appalachian Plateaus province, where the coal-bearing formations of Pennsylvanian age are nearly flat lying or very gently dipping. Diagonally extending east-northeastward across the middle of the quadrangle are several belts of faulted, overturned, and steeply dipping rocks of Mississippian and Pennsylvanian age which are in the fault system that separates the Appalachian Plateaus from the Valley and Ridge provinces. Several belts of Pennsylvanian rocks in this area contain coal beds that are exposed at the surface. South of the faulted and overturned belts of Mississippian and Pennsylvanian rocks is an area of older faulted and folded noncoal-bearing rock formations, which are also part of the Appalachian Valley and Ridge province and which form much of the southern half of the Honaker quadrangle.
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