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January 1, 1987

Maps showing the stratigraphic framework and Quaternary geologic history of eastern Long Island Sound Maps showing the stratigraphic framework and Quaternary geologic history of eastern Long Island Sound

No abstract available.

January 1, 1987

Median-porosity contour maps of the J Sandstone, Dakota Group, in the Denver Basin, Colorado, Nebraska, and Wyoming Median-porosity 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 is present in the Denver basin in eastern Colorado, southeastern Wyoming, and southwestern Nebraska. Deposited during a regression of the Cretaceous epicontinental sea, this informally named unit is composed primarily of sandstone and shale of deltaic and near shore-marine origin. The J sandstone can be divided into an upper...

January 1, 1987