Paleozoic section in the vicinity of Dotsero, Colorado

Abstract

Research Article| December 01, 1939 Paleozoic section in the vicinity of Dotsero, Colorado CHARLES FERNANDO BASSETT CHARLES FERNANDO BASSETT Search for other works by this author on: GSW Google Scholar GSA Bulletin (1939) 50 (12_1): 1851–1866. https://doi.org/10.1130/GSAB-50-1851 Article history received: 20 Dec 1938 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 CHARLES FERNANDO BASSETT; Paleozoic section in the vicinity of Dotsero, Colorado. GSA Bulletin 1939;; 50 (12_1): 1851–1866. doi: https://doi.org/10.1130/GSAB-50-1851 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Paleozoic sequence of strata is well exposed in the northeast end of Glenwood canyon and near the junction of the Eagle and Colorado rivers. Although the formations are folded and faulted they have not been affected by mineralization here as in many other places where they have been studied. The Cambrian starts with a locally developed conglomerate of quartz pebbles resting on the weathered and eroded surface of the pre-Cambrian schist. This is succeeded by the Sawatch quartzite which contains one fossiliferous shale bed. The dolomites between the Sawatch quartzite and the Devonian Parting quartzite member are usually assigned to the Ordovician on account of their stratigraphic position. The dolomites occupying this position in the vicinity of Dotsero have yielded a fauna of upper Cambrian dendroid graptolites and are here named the Dotsero dolomite: These are overlain disconformably by the Devonian Chaffee formation which is subdivided into the Parting quartzite member and the Dyer dolomite member, separated by a weathered zone at the top of the Parting quartzite member. The Mississippian Leadville limestone rests disconformably on the Devonian. The thick upper bed is an oolite which is not characteristic elsewhere. The surface became pitted with sink holes before the deposition of the Pennsylvania strata. The latter are called the McCoy formation and exhibit abrupt lateral changes throughout their thickness. They pass upward without apparent break into gypsum and red beds which are tentatively assigned to the Maroon formation of the Permian. A comparison is made with the Pennsylvanian-Permian section at McCoy. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.