Abstract
Research Article| January 01, 1937 Petrographic analysis of the Glenwood beds of southeastern Minnesota GEORGE A. THIEL GEORGE A. THIEL Search for other works by this author on: GSW Google Scholar GSA Bulletin (1937) 48 (1): 113–122. https://doi.org/10.1130/GSAB-48-113 Article history received: 22 May 1936 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 GEORGE A. THIEL; Petrographic analysis of the Glenwood beds of southeastern Minnesota. GSA Bulletin 1937;; 48 (1): 113–122. doi: https://doi.org/10.1130/GSAB-48-113 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 INTRODUCTIONIn a recent paper1 on the petrographic characteristics of the St. Peter sandstone, the writer pointed out that in the upper Mississippi Valley, the petrographic constituents of the upper portion of the St. Peter are more typical of the Glenwood beds than of the major portion of the St. Peter sandstone. Throughout the area of outcrop of the sandstone in southeastern Minnesota and northeastern Iowa, the upper 3–10 feet of the formation is thin-bedded, more poorly sorted, and consists of coarser sand and more fine silt and clay than the greater part of the formation. Further studies of numerous samples from widely separated outcrops of the Glenwood beds and underlying clayey sandstone layers indicate that the early Mohawkian sea reworked the upper part of the St. Peter sands in the upper Mississippi Valley, and that additional clastic sediments from new source areas, differing both texturally and petrographically from . . . 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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