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Extinction of Cloudina and Namacalathus at the Precambrian-Cambrian boundary in Oman

2003; Geological Society of America; Volume: 31; Issue: 5 Linguagem: Inglês

10.1130/0091-7613(2003)031 2.0.co;2

1943-2682

Joachim E. Amthor, J. P. Grotzinger, Stefan Schröder, Samuel A. Bowring, Jahandar Ramezani, Mark W. Martin, Albert Matter,

Paleontology and Evolutionary Biology

Research Article| May 01, 2003 Extinction of Cloudina and Namacalathus at the Precambrian-Cambrian boundary in Oman Joachim E. Amthor; Joachim E. Amthor 1Petroleum Development Oman, Box 81, Muscat, PC 113, Sultanate of Oman Search for other works by this author on: GSW Google Scholar John P. Grotzinger; John P. Grotzinger 2 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA Search for other works by this author on: GSW Google Scholar Stefan Schröder; Stefan Schröder 2 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA Search for other works by this author on: GSW Google Scholar Samuel A. Bowring; Samuel A. Bowring 2 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA Search for other works by this author on: GSW Google Scholar Jahandar Ramezani; Jahandar Ramezani 2 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA Search for other works by this author on: GSW Google Scholar Mark W. Martin; Mark W. Martin 2 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA Search for other works by this author on: GSW Google Scholar Albert Matter Albert Matter 3Geologisches Institut, Universität Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland Search for other works by this author on: GSW Google Scholar Geology (2003) 31 (5): 431–434. https://doi.org/10.1130/0091-7613(2003)031 2.0.CO;2 Article history received: 20 Nov 2002 rev-recd: 04 Feb 2003 accepted: 07 Feb 2003 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 Joachim E. Amthor, John P. Grotzinger, Stefan Schröder, Samuel A. Bowring, Jahandar Ramezani, Mark W. Martin, Albert Matter; Extinction of Cloudina and Namacalathus at the Precambrian-Cambrian boundary in Oman. Geology 2003;; 31 (5): 431–434. doi: https://doi.org/10.1130/0091-7613(2003)031 2.0.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 Biostratigraphic, carbon isotope, and U-Pb zircon geochronological data from the Ara Group of Oman indicate an abrupt last appearance of Cloudina and Namacalathus coincident with a large-magnitude, but short-lived negative excursion in the carbon isotope composition of seawater that is globally coincident with the Precambrian-Cambrian boundary. U-Pb zircon age data from an intercalated ash bed directly define this negative excursion to be at 542.0 ± 0.3 Ma, consistent with previous age constraints from Siberia and Namibia. Combined with the global biostratigraphic record, these new data strengthen hypotheses invoking mass extinction within terminal Proterozoic ecosystems at or near the Precambrian-Cambrian boundary. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.