Testing the Sequence Stratigraphy Model: Response Of Fusulinacean Fauna to Sea-Level Fluctuations (Examples From Pennsylvanian and Cisuralian of the Pricaspian–Southern Urals Region)
Vladimir I. Davydov, Tamra A. Schiappa, Walter S. Snyder, 2003. "Testing the Sequence Stratigraphy Model: Response Of Fusulinacean Fauna to Sea-Level Fluctuations (Examples From Pennsylvanian and Cisuralian of the Pricaspian–Southern Urals Region)", Micropaleontologic Proxies for Sea-Level Change and Stratigraphic Discontinuities, Hilary Clement Olson, R. Mark Leckie
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The Pricaspian and southern Urals region is paleogeographically situated between the Boreal and Tethyan provinces and comprises taxa of both affinities. Both sedimentologic analyses and the graphic correlation (GC) technique was used to clarify the Pennsylvanian and Cisuralian sequence stratigraphic framework in the Pricaspian and southern Urals region. Fusulinacean zones utilized for the region are based on a well established evolutionary framework. The study of phylogenetic successions combined with GC were used to distinguish between locally controlled initial occurrences and speciation. In the Pricaspian and southern Urals region, sequence boundaries coincide with the bases of several fusulinacean zones. These eustatic events (i.e., sea-level lowstand) correspond with significant extinction in fusulinacean evolution. The base of the Asselian (i.e., the base of the Permian), the base of the Sakmarian, and some fusulinacean zones coincide with highstands. Therefore, fusulinacean speciation appears to be associated with both highstands and lowstands. Sea-level lowstands may have been very stressful for global fusulinacean assemblages and may have been a catalyst for both speciation and extinction. Highstands also may have created environmental opportunities and appear to be associated more closely with fusulinacean speciation than with extinction. Sequence boundaries located within fusulinacean zones perhaps reflect local tectonism or local climatic changes.
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Micropaleontology and biostratigraphy play vital roles for deciphering the stratigraphic record produced by changes in relative sea level, interpreting the history of global sea-level change, and testing models for the causes of sea-level fluctuations due to the variable influences of tectonics, glacio-eustasy, and climate. The stratigraphic architecture developed in response to changing eustasy, accommodation space, and sediment supply along continental margins, in epicontinental seas, and on carbonate platforms can be interpreted using the tools of marine micropaleontology. Microfossils provide chronostratigraphic control and a wealth of paleoenvironmental information about depositional environments as well as post-depositional changes to those environments. This volume demonstrates clearly that micropaleontologic proxies of environmental change provide a powerful dimension to the interpretive potential of stratigraphic sequences produced by changes in relative sea level and eustasy. Studies in the volume range from paralic to bathyal environments, span Pennsylvanian through Holocene stratigraphy, encompass a variety of microfossil groups and include a wide spectrum of techniques and paleoenvironmental proxies. The volume has been designed for graduate students and professionals interested in a wide range of subjects.