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Wildcat wells drilled near Thermopolis, Wyo., within the last two years have demonstrated that the Warm Springs domes, at the east end of the Thermopolis anticline, and the Hamilton dome or Cottonwood anticline, as it is called in a previous report 1 folds heretofore regarded as barren really contain oil in commercial quantities. The product of the Warm Springs domes is a veryheavy, dark oil, derived, like that of the Lander field, from the Embar beds, and the entire output is estimated at 800 to 1,000 barrels a day. The product of the Hamilton dome is a somewhat lighter, oil from the Chugwater formation, and this is the first discovery of petroleum in commercial quantities in the Chugwater. Oil was struck too recently in this dome to justify an estimate of its probable production. The geographic position of the Warm Springs and Hamilton domes is shown on the index map (fig. 4). They are easily accessible by automobile from Thermopolis, on the Chicago, Burlington & Quincy Eailroad. The Thermopolis anticline is a well-known and well-marked arch of the rocks in Hot Springs County, extending about 22 miles in an east-west direction through the town of Thermopolis. It is shown on the maps prepared by Darton 2 and Fisher 3 and is briefly described by Lupton,4 who, owing to the occurrence of hot springs near its axis and^the exposure near its 'crest of the lowest oil-bearing formation, decided that it was of doubtful value as a reservoir for oil and gas and did not attempt to determine its geologic structure.

Contributions to economic geology, 1919, Part II, Mineral fuels--Oil in the Warm Springs and Hamilton domes, near Thermopolis, Wyoming