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Geology; May 2003; v. 31; no. 5; p. 431-434; DOI: 10.1130/0091-7613(2003)031<0431:EOCANA>2.0.CO;2
© 2003 Geological Society of America
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Extinction of Cloudina and Namacalathus at the Precambrian-Cambrian boundary in Oman

Joachim E. Amthor1, John P. Grotzinger*,2, Stefan Schröder*,2, Samuel A. Bowring*,2, Jahandar Ramezani*,2, Mark W. Martin*,2 and Albert Matter*,3

1 Petroleum Development Oman, Box 81, Muscat, PC 113, Sultanate of Oman
2 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
3 Geologisches Institut, Universität Bern, Baltzerstrasse 1, CH-3012 Bern, Switzerland

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.

Key Words: extinction • Proterozoic • Cambrian • Oman • U-Pb • geochronology • carbon isotopes




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