Late Miocene marine carbon-isotopic shift and synchroneity of some phytoplanktonic biostratigraphic events

Research Article| September 01, 1980 Late Miocene marine carbon-isotopic shift and synchroneity of some phytoplanktonic biostratigraphic events B. U. Haq; B. U. Haq 1Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543 Search for other works by this author on: GSW Google Scholar T. R. Worsley; T. R. Worsley 2University of Ohio, Athens, Ohio 45701 Search for other works by this author on: GSW Google Scholar L H. Burckle; L H. Burckle 3Lamont-Doherty Geological Observatory, Palisades, New York 10964 Search for other works by this author on: GSW Google Scholar R. G. Douglas; R. G. Douglas 4University of Southern California, Los Angeles, California 90007 Search for other works by this author on: GSW Google Scholar L. D. Keigwin, Jr.; L. D. Keigwin, Jr. 5University of Rhode Island, Kingston, Rhode Island 02881 Search for other works by this author on: GSW Google Scholar N. D. Opdyke; N. D. Opdyke 6Lamont-Doherty Geological Observatory, Palisades, New York 10964 Search for other works by this author on: GSW Google Scholar S. M. Savin; S. M. Savin 7Case Western Reserve University, Cleveland, Ohio 44106 Search for other works by this author on: GSW Google Scholar M. A. Sommer, II; M. A. Sommer, II 8Florida State University, Tallahassee, Florida 32306 Search for other works by this author on: GSW Google Scholar E. Vincent; E. Vincent 9Scripps Institution of Oceanography, La Jolla, California 92093 Search for other works by this author on: GSW Google Scholar F. Woodruff F. Woodruff 10University of Southern California, Los Angeles, California 90007 Search for other works by this author on: GSW Google Scholar Geology (1980) 8 (9): 427–431. https://doi.org/10.1130/0091-7613(1980)82.0.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 B. U. Haq, T. R. Worsley, L H. Burckle, R. G. Douglas, L. D. Keigwin, N. D. Opdyke, S. M. Savin, M. A. Sommer, E. Vincent, F. Woodruff; Late Miocene marine carbon-isotopic shift and synchroneity of some phytoplanktonic biostratigraphic events. Geology 1980;; 8 (9): 427–431. doi: https://doi.org/10.1130/0091-7613(1980)82.0.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 SocietyGeology Search Advanced Search Abstract A search for stable-isotopic signals and biostratigraphic events in Deep Sea Drilling Project (DSDP) cores to improve chronologic resolution with an aim to reconstruct the paleoenvironment of the preglacial and postglacial Miocene oceans has led to the recognition of an apparently global decrease in the benthic foraminiferal δ 13C in the latest Miocene. This carbon-isotopic shift is consistently bracketed by the first evolutionary appearances of several taxa of phytoplankton the ages of which have been accurately estimated from paleomagnetically dated piston cores. The first appearance of nannofossils Amaurolithus primus and A. delicatus at 6.25 m.y. B.P. and the diatoms Thalassiosira praeconvexa and Nitzschia miocenica elongata at 6.10 and 6.00 m.y. B.P., respectively, and the carbon-isotopic shift itself (dated between 6.10 and 5.90 m.y. B.P.) provide convenient synchronous events to aid in the reconstruction of the late Miocene world ocean. Magnetostratigraphically estimated ages of other useful late Miocene nannofossil events include first appearances of Discoaster quinqueramus at 8.00 m.y. B.P., D. surculus at 6.40 m.y. B.P., Amaurolithus tricorniculatus s.s. at 5.70 m.y. B.P., A. amplificus at 5.65 m.y. B.P., and Ceratolithus acutus at 5.20 m.y. B.P., and the last appearances of D. quinqueramus at 5.45 m.y. B.P. and A. amplificus at 5.30 m.y. B.P. 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.