The Pierre Shale, a thick unit of Upper Cretaceous marine strata, crops out in a belt as much as 20 miles wide that parallels the Front Range in Colorado. |
This map shows the elevation, in feet above sea level, of the top of the Cretaceous Pierre Formation in North Dakota. Throughout the western part of the state ... |
18 окт. 2024 г. · The Pierre consists of about 600 m (about 2,000 feet) of dark gray shale, some sandstone, and many layers of bentonite (altered volcanic-ash ... |
Shape file of the outcrops of the Pierre Shale in South Dakota. Taken from USGS database. |
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