Research Article| January 01, 1987 Dissected paleotopography and base-level changes in a Triassic fluvial sequence Mary J. Kraus; Mary J. Kraus 1Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309 Search for other works by this author on: GSW Google Scholar Larry T. Middleton Larry T. Middleton 2Department of Geology, Northern Arizona University, Flagstaff, Arizona 86011 Search for other works by this author on: GSW Google Scholar Geology (1987) 15 (1): 18–21. https://doi.org/10.1130/0091-7613(1987)15<18:DPABCI>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Mary J. Kraus, Larry T. Middleton; Dissected paleotopography and base-level changes in a Triassic fluvial sequence. Geology 1987;; 15 (1): 18–21. doi: https://doi.org/10.1130/0091-7613(1987)15<18:DPABCI>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 SocietyGeology Search Advanced Search Abstract At one stratigraphic level in Petrified Forest National Park in Arizona, fluvial mudrocks of the Chinle Formation are truncated by areally extensive deep scours that are filled dominantly by pedogenically modified mudrocks. Color differences between paleosols, developed on scoured and scour-fill deposits, facilitate recognition of the dissected interval. The mudstone-filled scour system records a period of channel incision and widespread gullying caused by lowered base level. Although it is difficult to document subsidence rates in the Chinle basin, the tectonic setting suggests that the enormous scour system could be the result of fluctuations in regional thermal activity during Late Triassic time. Similar scour and fill should occur in other fluvial sequences; however, because they both truncate and are filled by mudrocks, identification can be difficult. Recognition of them is important because they are indicators of base-level fluctuations and thus are useful in unraveling the depositional history of a basin. 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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Kraus et al. (1987) studied this question.