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The "region described in this report includes about 385 square miles on the western margin of the Big Horn Basin, in the north-central part of Park County, Wyo. It is a narrow belt extending from Cody southward for about 40 miles. The steep front of the Absaroka Mountains forms its western and southern borders. / Several rock formations that are not exposed in the region but that have been penetrated by wells crop out in Shoshone Canyon 5 miles west of Cody. They include the Madison, Amsden, Tensleep, and Phosphoria formations, of Carboniferous age. The oldest exposed sedimentary formation is the brick-red Chugwater formation, of Triassic age in this area, which is composed of nearly 1,000 feet of sandstone and shale. Overlying the Chugwater is the Sundance formation, of Upper Jurassic age, a series of fossiliferous marine shales, sandstones, and limestones and unfossiliferous red shales and gypsum with a total thickness of about 500 feet. The Morrison formation, of Upper Jurassic age and continental origin, overlies the Sundance and is about 500 feet thick. It is made up chiefly of brightly colored shales, light-colored sandstones, and conglomeratic sandstones, with some thin beds of freshwater limestone and nodular chalcedony. The Cloverly formation, the basal unit of the Cretaceous sequence, is restricted in this report to include only 100 to 200 feet of brown and buff thin-bedded sandstones and shales. This restriction places in the underlying Morrison some beds that probably have been assigned to the Cloverly in other regions. Overlying the Cloverly is the Thermo'polis shale, a dark-gray to black shale about . 600 feet thick, which contains numerous beds of bentonite. The sandstone in the lower part of this formation, generally known as the Muddy sand, is about 30 feet thick. Marine fossils have been found in the muddy sand and also in the shale of the Thermopolis. The overlying Mo'wry shale, which is about 400 feet thick, consists chiefly of siliceous shales and contains many bentonite beds. The Frontier formation conformably overlies the Mowry and consists of about 500 feet of alternating and lenticular sandstones and shales, with some bentonite beds, which seem to be more persistent than the bentonite beds in the underlying Mowry and Thermopolis shales. Overlying the Frontier formation is the Cody shale, a fossiliferous marine shale about 3,000 feet thick, which includes beds equivalent to parts of the Colorado and Montana groups of the Upper Cretaceous series. The marine Upper Cretaceous series closes with the Mesaverde formation, largely a succession of massive sandstones containing some coal beds near the base, but in part, at least, of marine origin. The

Geology and oil and coal resources of the region south of Cody, Park County, Wyoming