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Geology; July, 2007; v. 35; no. 7; p. 619-622; DOI: 10.1130/G23445A.1
© 2007 Geological Society of America
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Synchronous millennial-scale climatic changes in the Great Basin and the North Atlantic during the last interglacial

Rhawn F. Denniston1, Yemane Asmerom2, Victor Polyak2, Jeffrey A. Dorale3, Scott J. Carpenter3, Charles Trodick4, Brian Hoye4 and Luis A. González5

1 Department of Geology, Cornell College, 600 1st Street West, Mount Vernon, Iowa 52314, USA
2 Department of Earth and Planetary Science, Northrop Hall, University of New Mexico, Albuquerque, New Mexico 87131, USA
3 Department of Geoscience, Trowbridge Hall, University of Iowa, Iowa City, Iowa 52242, USA
4 Department of Geology, Cornell College, 600 1st Street West, Mount Vernon, Iowa 52314, USA
5 Department of Geology, 1475 Jayhawk Boulevard, University of Kansas, Lawrence, Kansas 66045-7613, USA

Stalagmites from Goshute Cave, located in the Great Basin of the western United States, preserve ~20,000 yr of millennial-scale oxygen isotopic variability during marine isotope stages 5c and 5b, similar in timing and structure to Dansgaard-Oeschger (D-O) events 23–21 from the Greenland Ice Sheet Project 2 record. That D-O interstades 23–21 were of longer duration than many of the later D-O events, coupled with the asymmetric shape of the D-O oxygen isotope curve, and the direct U-Th dating of the Goshute Cave stalagmites, allows for an improved understanding of the synchroneity of climatic changes between the western continental United States and the North Atlantic. Eastern Pacific–atmosphere interactions are a likely mechanism for transmission of millennial-scale climate variability into the Great Basin.

Key Words: speleothem • Great Basin • last interglacial • oxygen • Dansgaard-Oeschger event






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