The Kevin-Sunburst oil field of Montana has made slow but steady progress toward the position of a major field. Discovered in 1922, it was the first field in the United States to yield a truly important amount of oil from Jurassic strata, and while at present small quantities of oil may be produced from the Sundance formation of Jurassic age in Wyoming, the Kevin-Sunburst field, which draws its major production from the basal sand of the Ellis formation, remains the only important field that depends on the Jurassic.

The field is on a great, low dome, with the oil apparently...

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