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Research Article| May 01, 1944 Late Paleozoic stratigraphy, west-central and northwestern Colorado KENNETH G. BRILL, JR. KENNETH G. BRILL, JR. Search for other works by this author on: GSW Google Scholar GSA Bulletin (1944) 55 (5): 621–655. https://doi.org/10.1130/GSAB-55-621 Article history received: 20 Sep 1943 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 KENNETH G. BRILL; Late Paleozoic stratigraphy, west-central and northwestern Colorado. GSA Bulletin 1944;; 55 (5): 621–655. doi: https://doi.org/10.1130/GSAB-55-621 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 Pennsylvanian and Permian (?) sediments in west-central and northwestern Colorado crop out in an area of nearly 2300 square miles. Deposited in a trough between the Front Range landmass and Uncompahgre landmass, they consist mainly of red beds and coarse clastic sediment. Some gypsum and marine limestone occurs in the lower part of the sequence.The Belden shale, composed of dark shale and limestone, is ranked as a formation instead of a member. It replaces the Weber shale as applied to the basal Pennsylvanian in Colorado and is Des Moines in age. The Maroon formation, which rests on the Belden, consists of several thousand feet of red beds. Much, if not all, of it is Des Moines in age. All the gypsum in the lower Maroon is of Des Moines age. The term Weber quartzite is restricted in west-central Colorado to a white sandstone overlying the Maroon formation. The overlying widely distributed State Bridge formation is composed mainly of fine-grained, red, clastic sediment which attains a thickness of more than 5000 feet along the axis of the trough. It is believed to correlate with the Permian Phosphoria formation of northwestern Colorado. 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.
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