Intensive geological field work currently is being carried out in northeastern Nevada and northwestern Utah, in the northern part of the Basin-and-Range province. The first exploratory test of recent years is being drilled on the eastern side of the Pancake Range. Sediments are primarily Paleozoic and constitute one of the most complete and thickest sections of this group in America. Showings of oil, asphaltic material, and gas are known at several points. Devonian and Carboniferous limestones and the White Pine shale (Upper (?) Mississippian) are the best source rocks. Certain facies of the so-called Diamond Peak quartzite (Lower (?) Pennsylvanian) and the Weber conglomerate (Upper Pennsylvanian), as well as the Upper Paleozoic limestones themselves, may prove suitable r servoirs. The thermal effect of volcanic and granitic rocks on sediments is generally unimportant. The structure and stratigraphy indicate that there are anticlinal, fault, and stratigraphic traps within the area. Faulting probably will be the most important risk in exploration.

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