Abstract
Other| October 01, 2001 Measuring Recurrence of Marine Biotic Gradients: A Case Study from the Pennsylvanian-Permian Midcontinent THOMAS D. OLSZEWSKI; THOMAS D. OLSZEWSKI 1Department of Geological Sciences, Indiana University, Bloomington, IN 47405 Search for other works by this author on: GSW Google Scholar MARK E. PATZKOWSKY MARK E. PATZKOWSKY 2Department of Geosciences, The Pennsylvania State University, University Park, PA 16802 Search for other works by this author on: GSW Google Scholar PALAIOS (2001) 16 (5): 444–460. https://doi.org/10.1669/0883-1351(2001)016<0444:MROMBG>2.0.CO;2 Article history accepted: 30 Mar 2001 first online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation THOMAS D. OLSZEWSKI, MARK E. PATZKOWSKY; Measuring Recurrence of Marine Biotic Gradients: A Case Study from the Pennsylvanian-Permian Midcontinent. PALAIOS 2001;; 16 (5): 444–460. doi: https://doi.org/10.1669/0883-1351(2001)016<0444:MROMBG>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyPALAIOS Search Advanced Search Abstract The aim of this study was to determine whether biotic associations of Pennsylvanian-Permian brachiopods and bivalves from the northern Midcontinent differ in their degree of recurrence through time. The study interval includes 2.5 Myr that can be divided into 5 full and 2 partial composite depositional sequences separated by subaerial unconformities. These stratigraphic packages represent replicate natural experiments in establishing the benthic marine ecosystem of the basin. Based on cluster and ordination analyses, two discrete biofacies can be recognized—one dominated by brachiopods and the other by bivalves. Within each of these, environmental gradients can be recognized. The brachiopod gradient is interpreted to reflect the degree of water-column oxygenation, whereas the bivalve gradient is interpreted to reflect the transition from restricted to open-marine conditions. Comparison of measured recurrence with randomized data indicates that the ecological segregation of the two biofacies is maintained to a significant degree through the succession of depositional sequences in the study interval. In contrast, the gradients within each biofacies, although recognizable, are not maintained rigidly from sequence to sequence. There is also no significant difference in gradient recurrence between the two biofacies. These results imply that there is no need to call upon strong interspecific interactions to maintain the structure of these paleocommunities through time. You do not currently have access to this article.
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