Extinction of Perched Faunas

Research Article| October 01, 1974 Extinction of Perched Faunas J. G. Johnson J. G. Johnson 1Department of Geology, Oregon State University Corvallis, Oregon 97331 Search for other works by this author on: GSW Google Scholar Geology (1974) 2 (10): 479–482. https://doi.org/10.1130/0091-7613(1974)2<479:EOPF>2.0.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation J. G. Johnson; Extinction of Perched Faunas. Geology 1974;; 2 (10): 479–482. doi: https://doi.org/10.1130/0091-7613(1974)2<479:EOPF>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 SocietyGeology Search Advanced Search Abstract Regression of epicontinental seas could cause extinction of benthic marine organisms simply by destruction of their habitat, but many widespread regressions have occurred without a concomitant event of extinction. Important events of extinction can be shown to correspond to relatively rapid regressions that occurred when epicontinental seas had previously attained large dimensions.Sustained transgression, such as is associated with the formation of a cratonic sequence, allows migration of marine organisms into widespread epicontinental seas, where they adapt and become stenotopic to variable degrees. Thus, these organisms compose perched faunas (new term) in the sense that their supporting environment is destined to disappear. Relatively rapid regressions that occur under these circumstances result in extinction. Relatively slow regressions, such as occur at the end of cratonic sequences, allow speciation and extinction to become diffuse and thus not recognizable as a distinct event. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.