Origin of the Pass Peak Formation and Equivalent Early Eocene Strata, Central Western Wyoming

Research Article| January 01, 1971 Origin of the Pass Peak Formation and Equivalent Early Eocene Strata, Central Western Wyoming JAMES R STEIDTMANN JAMES R STEIDTMANN Department of Geology, University of Wyoming, Laramie, Wyoming 82070 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1971) 82 (1): 159–176. https://doi.org/10.1130/0016-7606(1971)82[159:OOTPPF]2.0.CO;2 Article history received: 17 Mar 1970 rev-recd: 05 Aug 1970 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation JAMES R STEIDTMANN; Origin of the Pass Peak Formation and Equivalent Early Eocene Strata, Central Western Wyoming. GSA Bulletin 1971;; 82 (1): 159–176. doi: https://doi.org/10.1130/0016-7606(1971)82[159:OOTPPF]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Pass Peak Formation is a Tertiary basin-flank deposit exposed throughout much of the Hoback Basin; a depression physiographically distinct from, but structurally continuous with, the northern Green River Basin. Two lithofacies of the Pass Peak Formation are identified. A northern quartzite conglomerate-sandstone facies, possibly as thick as 3200 ft, intertongues southward with a sandstone-siltstone facies 1500 ft thick. This in turn extends southward and intertongues with the Wasatch Formation. Arkosic sandstone and conglomerate intertongues with the Pass Peak on the east.Trends in grain size and sandstone composition, and directional structures indicate that: (1) a sedimentary source to the north supplied quartzite cobbles and associated garnet-bearing sand and (2) an igneous or metamorphic source, or both, to the northeast supplied abundant arkosic debris. Regional geology suggests that the Pinyon Conglomerate to the north was the source for Pass Peak sediments and the Precambrian core of the Wind River Range to the northeast was the source for the arkosic sediments to the east.Uplift in the Mt. Leidy Highlands, the Gros Ventre Mountains, and the Wind River Range during the early Eocene resulted in the deposition of fanglomerate in the northern part of the basin and coarse arkosic alluvial plain sediments in the eastern part. The finer debris from the north was carried southward onto a flood-plain where it mixed with the finer sediments from the east. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.