The Summit Springs Unit No. 1 well drilled by the Standard of California and Continental Oil companies in northwestern White Pine County, Nevada, penetrated 5,200 feet of sediments containing 23% gypsum and anhydrite beds. Wolfcampian fusulinids occur in beds underlying the lowest gypsum. The presence of evaporites had not been suspected from studies of the outcrops. Shows of oil and gas were encountered in this sequence of beds. Lack of knowledge precludes consideration of a barrier between the evaporites and the open sea.

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