Stream Bank Failure and Rotational Slumping: Preservation and Significance in the Geologic Record
1971; Geological Society of America; Volume: 82; Issue: 5 Linguagem: Inglês
10.1130/0016-7606(1971)82[1251
ISSN1943-2674
Autores Tópico(s)Drilling and Well Engineering
ResumoResearch Article| May 01, 1971 Stream Bank Failure and Rotational Slumping: Preservation and Significance in the Geologic Record ROBERT L LAURY ROBERT L LAURY Department of Geological Sciences. Southern Methodist University. Dallas. Texas 75222 Search for other works by this author on: GSW Google Scholar Author and Article Information ROBERT L LAURY Department of Geological Sciences. Southern Methodist University. Dallas. Texas 75222 Publisher: Geological Society of America Received: 21 Aug 1970 Revision Received: 15 Jan 1971 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1971, 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 (1971) 82 (5): 1251–1266. https://doi.org/10.1130/0016-7606(1971)82[1251:SBFARS]2.0.CO;2 Article history Received: 21 Aug 1970 Revision Received: 15 Jan 1971 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation ROBERT L LAURY; Stream Bank Failure and Rotational Slumping: Preservation and Significance in the Geologic Record. GSA Bulletin 1971;; 82 (5): 1251–1266. doi: https://doi.org/10.1130/0016-7606(1971)82[1251:SBFARS]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 Evidence of stream bank failure in the geologic record is surprisingly meager. Observations on modern stream bank failure and on ancient analogues suggest that bank failures most likely to be preserved in the stratigraphic record are those produced by large-scale shear failure—in particular, by rotational slumping.Although the the frequency of bank failures is much higher along streams of alluvial valleys than along distributaries of deltaic plains, potential for preservation of these large-scale structures is greater in the latter environment. Preservation is apparently most easily accomplished by the type of rotational slumping in which base failure, rather than slope failure, is involved. Base failure is manifest by large slump blocks with surfaces of failure passing below the local thalweg and, therefore, below the depth of active stream scouring; preservation of at least subthalweg parts of slumped masses is, thus, theoretically possible. Areas of active scouring in which banks and thalwegs are cut in very cohesive silt- and clay-rich sediments favor the occurrence of deep rotational slumping and possibly base failure. Such conditions appear to be more common in low-energy deltaic plain or tidal flat environments than in alluvial valleys.Consequently, fossil displaced bank sediments are predictably rare due to the somewhat restricted environmental conditions under which they can be preserved best, the actual low frequency of bank failure within these environments, and possibly an even lower frequency of true base failure in these same environments. 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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