Abstract
Research Article| January 01, 1891 Stratigraphy of the Carboniferous in Central Iowa CHARLES R. KEYES CHARLES R. KEYES Search for other works by this author on: GSW Google Scholar Author and Article Information CHARLES R. KEYES Publisher: Geological Society of America First Online: 02 Mar 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 © 1891 Geological Society of America GSA Bulletin (1891) 2 (1): 277–292. https://doi.org/10.1130/GSAB-2-277 Article history First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation CHARLES R. KEYES; Stratigraphy of the Carboniferous in Central Iowa. GSA Bulletin 1891;; 2 (1): 277–292. doi: https://doi.org/10.1130/GSAB-2-277 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 IntroductionThe exposed stratified rocks of central Iowa are made up chiefly of Lower Coal Measure clays, shales, and sandstones. In the southeastern portion of the area the upper member (for Iowa) of the Sub-Carboniferous—the St. Louis limestone—is exposed along the Des Moines river. To the westward the so-called Middle Coal Measures and the Upper Coal Measures are represented. Hitherto it has been supposed that the three recognized divisions of the upper Carboniferous rocks in the state have each a maximum thickness of about two hundred feet. Lately, however, the Upper Coal Measures alone have been discovered to have at least double this estimate; and at a still later date the vertical extent of the other two formations has been found to differ very much from the limit usually assigned: the Middle Coal Measures being considerably thinner than was supposed, and the Lower Coal Measures very much thicker. . . . 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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