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Maps showing mines, prospects, and mineral localities in and near the Dolly Ann Roadless Area, Alleghany County, Virginia Maps showing mines, prospects, and mineral localities in and near the Dolly Ann Roadless Area, Alleghany County, Virginia
The Dolly Ann Roadless Area comprises 7,900 acres (3,200 ha) in the George Washington National Forest in west-central Virginia. The study area is in central Alleghany County, northeast of Covington, Va. (fig. 1). U.S. Forest Service Route 125 and U.S. Highway 220 furnish vehicular access to the edges of the area, and several foot trails provide access to the interior and peripheral...
Median-permeability contour maps of the J sandstone, Dakota Group, in the Denver Basin, Colorado, Nebraska, and Wyoming Median-permeability contour maps of the J sandstone, Dakota Group, in the Denver Basin, Colorado, Nebraska, and Wyoming
The Lower Cretaceous J sandstone of the Dakota Group (MacKenzie, 1965) is present in the Denver basin in eastern Colorado, southeastern Wyoming, and southwestern Nebraska. This informally named unit deposited during a regression of the Cretaceous epi continental sea and is composed primarily of sandstone and shale of deItaic and near-shore marine origin. The J sandstone can be divided...