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An appraisal of Oregon's prospects as a possible future oil province requires consideration of two widely separated regions where thick sections of unmetamorphosed marine sediments occur: (1) the Coast Range Province of Tertiary rocks, and (2) the Central Oregon Province of Mesozoic and Paleozoic sediments. Between these two regions is the north-south-trending Cascade Range of late Tertiary volcanics. The remainder of the state, except for the metamorphic and plutonic masses of the Klamath Mountains in the southwest, and the Blue-Wallowa Mountains in the northeast, is covered by a thick section of volcanic rocks, with interbedded continental sediments, of Tertiary to Recent age, which conceal any pre-Tertiary marine sediments which may be present. Two parts of this vast concealed area, the Harney basin in southeastern Oregon, and the Vale-Ontario area in central easternmost Oregon, have attracted considerable attention from wildcatters and promoters, and are also discussed briefly for that reason.

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