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1 Surface and shallow oil-impregnated rocks and shallow oil fields in the United States1965oil-impregnated rocks; shallow oil fields; petroleum-impregnated outcrops; tar sandsPetroleum-impregnated outcrops are widespread throughout eastern Utah and less so in the west and southwest. Within and around the periphery of the Uinta Basin, in the northeast are grouped some the best known "tar sands" in the United States, including the Sunnyside, Asphalt Ridge, and Whiterock de...
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