U-Pb Ages from the Neoproterozoic Doushantuo Formation, China
- D. Condon, Maoyan Zhu, S. Bowring, Wei Wang, A. Yang, Yu-gan Jin
- Geography, Environmental ScienceScience
- 1 April 2005
U-Pb zircon dates from volcanic ash beds within the Doushantuo Formation (China) indicate that its deposition occurred between 635 and 551 million years ago, indicating synchronous deglaciation.
Priscoan (4.00–4.03 Ga) orthogneisses from northwestern Canada
- S. Bowring, I. Williams
- Geology
- 21 January 1999
Abstract Ancient crustal rocks provide the only direct evidence for the processes and products of early Earth differentiation. SHRIMP zircon U-Th-Pb dating has identified, amongst the Acasta gneisses…
U-Pb zircon date from the Neoproterozoic Ghaub Formation, Namibia: Constraints on Marinoan glaciation
- K. Hoffmann, D. Condon, S. Bowring, J. Crowley
- Geology
- 1 September 2004
Dropstone-bearing glaciomarine sedimentary rocks of the Ghaub Formation within metamorphosed Neoproterozoic basinal strata (Swakop Group) in central Namibia contain interbedded mafic lava flows and…
Reassessing the uranium decay constants for geochronology using ID-TIMS U–Pb data
- B. Schoene, J. Crowley, D. Condon, M. Schmitz, S. Bowring
- Geology
- 15 January 2006
Biostratigraphic and Geochronologic Constraints on Early Animal Evolution
- J. Grotzinger, S. Bowring, B. Saylor, A. J. Kaufman
- Geology, Environmental ScienceScience
- 27 October 1995
Two distinct evolutionary pulses, represented by the Vendian Ediacaran fauna and Cambrian small shelly faunas, are generally thought to characterize the emergence of macroscopic animals at the end of…
High-precision timeline for Earth’s most severe extinction
- S. Burgess, S. Bowring, S. Shen
- Environmental Science, GeographyProceedings of the National Academy of Sciences
- 10 February 2014
This work presents a high-precision age model for the end-Permian mass extinction, which was the most severe loss of marine and terrestrial biota in the last 542 My, that allows exploration of the sequence of events at millennial to decamillenial timescales 252 Mya and establishes an accurate time point for evaluating the plausibility of trigger and kill mechanisms.
Geochronologic constraints on the chronostratigraphic framework of the Neoproterozoic Huqf Supergroup, Sultanate of Oman
- S. Bowring, J. Grotzinger, D. Condon, J. Ramezani, M. Newall, P. Allen
- GeologyAmerican Journal of Science
- 1 December 2007
The Huqf Supergroup, Sultanate of Oman, contains an important record of Neoproterozoic history, including evidence for two glaciations, a massive reorganization of the global carbon cycle, and the…
Evolution of the 87Sr/86Sr composition of Neoproterozoic seawater
- G. Halverson, F. Dudás, A. Maloof, S. Bowring
- Environmental Science, Geography
- 6 December 2007
Extinction of Cloudina and Namacalathus at the Precambrian-Cambrian boundary in Oman
- J. Amthor, J. Grotzinger, A. Matter
- Environmental Science, Geology
- 1 May 2003
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,…
U–Pb systematics of the McClure Mountain syenite: thermochronological constraints on the age of the 40Ar/39Ar standard MMhb
- B. Schoene, S. Bowring
- Geology
- 22 March 2006
Recent advances in U–Pb geochronology allow unprecedented levels of precision in the determination of geological ages. However, increased precision has also illuminated the importance of…
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