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STRATIGRAPHY OF THE UPPER CAMBRIAN, LLANO UPLIFT, TEXAS

1947; Geological Society of America; Volume: 58; Issue: 1 Linguagem: Inglês

10.1130/0016-7606(1947)58[109

1943-2674

Josiah Bridge, V. E. Barnes, Preston E. Cloud,

Maritime and Coastal Archaeology

Research Article| January 01, 1947 STRATIGRAPHY OF THE UPPER CAMBRIAN, LLANO UPLIFT, TEXAS JOSIAH BRIDGE; JOSIAH BRIDGE U. S GEOLOGICAL SURVEY, WASHINGTON 25, D. C.; BUREAU OF ECONOMIC GEOLOGY, UNIVERSITY OF TEXAS, TEXAS; U. S. GEOLOGICAL SURVEY, WASHINGTON 25, D. C. Search for other works by this author on: GSW Google Scholar VIRGIL E BARNES; VIRGIL E BARNES U. S GEOLOGICAL SURVEY, WASHINGTON 25, D. C.; BUREAU OF ECONOMIC GEOLOGY, UNIVERSITY OF TEXAS, TEXAS; U. S. GEOLOGICAL SURVEY, WASHINGTON 25, D. C. Search for other works by this author on: GSW Google Scholar PRESTON E CLOUD, JR PRESTON E CLOUD, JR U. S GEOLOGICAL SURVEY, WASHINGTON 25, D. C.; BUREAU OF ECONOMIC GEOLOGY, UNIVERSITY OF TEXAS, TEXAS; U. S. GEOLOGICAL SURVEY, WASHINGTON 25, D. C. Search for other works by this author on: GSW Google Scholar Author and Article Information JOSIAH BRIDGE U. S GEOLOGICAL SURVEY, WASHINGTON 25, D. C.; BUREAU OF ECONOMIC GEOLOGY, UNIVERSITY OF TEXAS, TEXAS; U. S. GEOLOGICAL SURVEY, WASHINGTON 25, D. C. VIRGIL E BARNES U. S GEOLOGICAL SURVEY, WASHINGTON 25, D. C.; BUREAU OF ECONOMIC GEOLOGY, UNIVERSITY OF TEXAS, TEXAS; U. S. GEOLOGICAL SURVEY, WASHINGTON 25, D. C. PRESTON E CLOUD, JR U. S GEOLOGICAL SURVEY, WASHINGTON 25, D. C.; BUREAU OF ECONOMIC GEOLOGY, UNIVERSITY OF TEXAS, TEXAS; U. S. GEOLOGICAL SURVEY, WASHINGTON 25, D. C. Publisher: Geological Society of America Received: 15 Jul 1946 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1947, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1947) 58 (1): 109–124. https://doi.org/10.1130/0016-7606(1947)58[109:SOTUCL]2.0.CO;2 Article history Received: 15 Jul 1946 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation JOSIAH BRIDGE, VIRGIL E BARNES, PRESTON E CLOUD; STRATIGRAPHY OF THE UPPER CAMBRIAN, LLANO UPLIFT, TEXAS. GSA Bulletin 1947;; 58 (1): 109–124. doi: https://doi.org/10.1130/0016-7606(1947)58[109:SOTUCL]2.0.CO;2 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 two formations and eight members that constitute the Upper Cambrian in the Llano uplift of central Texas are described or redefined, and their lithic characters in 19 measured sections are graphically summarized. Standard reference to them is thus furnished.The Riley formation comprises the basal Paleozoic strata of the Llano uplift. Its initial sediments were deposited on a submerged pre-Cambrian terrane having a known topographic relief as great as 800 feet. Its thickness normally averages about 680 feet but ranges from probably less than 200 to about 800 feet. At most places it is subequally divisible between the Hickory sandstone member below and the Cap Mountain limestone member above, with the thin but widespread, glauconitic Lion Mountain sandstone member capping and completing the sequence.The Wilberns formation includes five named members between the Riley formation and rocks of the Lower Ordovician Ellenburger group. It normally averages about 580 feet thick and ranges from 540 to 610 feet thick, but in the southeastern corner of the Llano uplift truncation of the upper beds has reduced it to 360 feet. The thin but widespread, nonglauconitic Welge sandstone member introduces the sequence. Above it is the Morgan Creek limestone member, grading to the succeeding argillaceous beds of the Point Peak shale. At the top of the sequence are the San Saba limestone and Pedernales dolomite members. These two are essentially equivalent and gradational facies, with the Pedernales normally overlying the San Saba. 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.