sandstone - teaching hand/display specimen of a yellow fine-grained aeolian sandstone from the Permo-Pennsylvanian Weber Formation
The Permo-Pennsylvanian Weber Sandstone was deposited in both fluvial and aeolian depositional environments, both with a source on the ancestral Uncompahgre Uplift. The aeolian Weber is a subarkosic fine to very fine-grained sand and was deposited in a dunefield.
The source of the aeolian sand was the underlying Permian Maroon Formation. Re-lithified in the the Weber, the sandstone has an average porosity of 12% and is the major producing horizon at the giant Rangely Oilfield in Rio Blanco County, Colorado. These specimens were collected north of Vernal, Utah along U.S. Highway 191.
The fluvial Weber sediments are predominantly arkosic sandstone, siltstone and shale, which act as barriers to the migration of petroleum.
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