The Black Hollow field is the only pre-Cretaceous oil producer in the Denver-Cheyenne basin. Production is from the Lyons sandstone of Permian age at a depth of approximately 9,000 feet. The initial test was located on an anticlinal closure defined by the seismograph. The pool covers 1,300 acres on which 10 producers and one dry hole have been drilled. The field is in the development stage. Accumulative production, on September, 1954, totals 430,000 barrels.

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