The uplifts that bound the northern Greater Green River Basin are dominantly fold-thrust south and westward oiler the basin block. Basin deeps are immediately adjacent to or under the overhang of the adjacent fold-thrust, creating characteristic structural relief in the range of 20,000 feet to 40,000 feet. The Wind River structure has been geologically and geophysically interpreted by Berg, (1961) and Berg and Romber (1966), as a huge fold-thrust about 40,000 feet of structural relief and at least 65,000 feet of overhang of the range core over basin sediments; and, containing the characteristic sheared-out, overturned limb that has been penetrated in several wells in several other frontal structures. The overturned limb .of this structure is, however, everywhere buried and unavailable for direct geological survey.