Abstract
Research Article| February 01, 1992 Dinoflagellate and calcareous nannofossil response to sea-level change in Cretaceous-Tertiary boundary sections Daniel Habib; Daniel Habib 1Queens College, City University of New York, Flushing, New York 11367 Search for other works by this author on: GSW Google Scholar Shimon Moshkovitz; Shimon Moshkovitz 2Geological Survey of Israel, Jerusalem 95501, Israel Search for other works by this author on: GSW Google Scholar Cynthia Kramer Cynthia Kramer 3Hamilton College, Clinton, New York 13323 Search for other works by this author on: GSW Google Scholar Author and Article Information Daniel Habib 1Queens College, City University of New York, Flushing, New York 11367 Shimon Moshkovitz 2Geological Survey of Israel, Jerusalem 95501, Israel Cynthia Kramer 3Hamilton College, Clinton, New York 13323 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1992) 20 (2): 165–168. https://doi.org/10.1130/0091-7613(1992)020<0165:DACNRT>2.3.CO;2 Article history First Online: 02 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 Daniel Habib, Shimon Moshkovitz, Cynthia Kramer; Dinoflagellate and calcareous nannofossil response to sea-level change in Cretaceous-Tertiary boundary sections. Geology 1992;; 20 (2): 165–168. doi: https://doi.org/10.1130/0091-7613(1992)020<0165:DACNRT>2.3.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 Stratigraphic sections in south-central Alabama were studied to test palynological evidence of sea-level change across the Cretaceous-Tertiary boundary. New evidence from both calcareous nannofossils and dinoflagellate cysts places the regional disconformity in Alabama (Type 1 sequence boundary) virtually at the K-T boundary. This suggests that sea-level fall may have contributed to the mass-extinction event. Dinofagellate diversity varies between systems tract components of coastal onlap. This parameter is useful for interpreting sea-level change in this part of the section, because dinoflagellates did not participate in the mass extinction. The iridium spikes in the roadcut near Braggs are of earliest Danian age and correlate in relative magnitude with the lower values reported from directly above the K-T boundary in the Gubbio stratotype section. Iridium was concentrated in marine flooding surfaces in episodes of higher productivity of algal organic matter at the time when the iridium-enriched ocean encroached on the shelf during the first Cenozoic episode of sea-level rise. 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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