Other| August 01, 2004 Ecological Signature of Lower Triassic Shell Beds of the Western United States DIANA L. BOYER; DIANA L. BOYER 1Department of Earth Sciences, University of California-Riverside, Riverside, CA, 92521, diana.boyer@email.ucr.edu Search for other works by this author on: GSW Google Scholar DAVID J. BOTTJER; DAVID J. BOTTJER 2Department of Earth Sciences, University of Southern California-Los Angeles, Los Angeles, CA, 90089-0740 Search for other works by this author on: GSW Google Scholar MARY L. DROSER MARY L. DROSER 3Department of Earth Sciences, University of California-Riverside, Riverside, CA, 92521 Search for other works by this author on: GSW Google Scholar Author and Article Information DIANA L. BOYER 1Department of Earth Sciences, University of California-Riverside, Riverside, CA, 92521, diana.boyer@email.ucr.edu DAVID J. BOTTJER 2Department of Earth Sciences, University of Southern California-Los Angeles, Los Angeles, CA, 90089-0740 MARY L. DROSER 3Department of Earth Sciences, University of California-Riverside, Riverside, CA, 92521 Publisher: SEPM Society for Sedimentary Geology Accepted: 24 Feb 2004 First Online: 03 Mar 2017 Online ISSN: 1938-5323 Print ISSN: 0883-1351 Society for Sedimentary Geology PALAIOS (2004) 19 (4): 372–380. https://doi.org/10.1669/0883-1351(2004)019<0372:ESOLTS>2.0.CO;2 Article history Accepted: 24 Feb 2004 First Online: 03 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 DIANA L. BOYER, DAVID J. BOTTJER, MARY L. DROSER; Ecological Signature of Lower Triassic Shell Beds of the Western United States. PALAIOS 2004;; 19 (4): 372–380. doi: https://doi.org/10.1669/0883-1351(2004)019<0372:ESOLTS>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 SocietyPALAIOS Search Advanced Search Abstract The end-Permian mass extinction was the largest Phanerozoic biotic crisis that resulted in significant and permanent ecological change. In order to examine ecological aspects of the recovery, shell beds deposited in environments ranging from nearshore to storm wave base were examined from three stratigraphic intervals in the Lower Triassic of the western U.S. Shell beds of the first interval, the Griesbachian Dinwoody Formation, are low-diversity, monospecific beds of Claraia and Promyalina, commonly with the inarticulate brachiopod Lingula. Data from the Nammalian Sinbad Limestone (Moenkopi Formation) provide a small window into the second time interval, in which common low-diversity (bivalves and microgastropods) shell beds occur. Within the third interval, represented by the Spathian Virgin Limestone (Moenkopi Formation) and Thaynes Formation, the bivalves Promyalina and Permophorus are found in both monospecific and polytaxic beds. Crinoids are also commonly found as encrinites and as significant contributors to the matrix of these beds. Shell beds range in thickness from pavements to 10s of centimeters and show variable internal complexity. The persistence of monospecific shell beds throughout these three intervals is significant as support for long-term stress during the recovery interval that is not apparent from sedimentological data alone. Although these Early Triassic beds primarily are comprised of members of the Modern Evolutionary Fauna, they are more similar to beds from the Paleozoic in thickness and taphonomic characteristics. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.