Preliminary Geologic Map of the Oil Mountain Quadrangle, Natrona County, Wyoming

The Oil Mountain quadrangle is at the intersection of Laramide structures, bridging the western margin of the Casper Arch and the southeastern margin of the Wind River Basin. The bedrock stratigraphy exposed in the quadrangle ranges from Upper Jurassic through early Eocene. Several of the geologic units are known oil and gas reservoirs or source rocks in the nearby Wind River and Powder River basins. These same units also may be local sources of groundwater or enriched in various mineral resources.