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Science 2 June 1995:
Vol. 268. no. 5215, pp. 1329 - 1333
DOI: 10.1126/science.268.5215.1329
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Articles

Beryllium-10 Dating of the Duration and Retreat of the Last Pinedale Glacial Sequence

J. C. Gosse 1, J. Klein 2, B. Lawn 2, R. Middleton 2, and E. B. Evenson 3

1 Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015, USA, and ESS-1 MS D462, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
2 Department of Physics, University of Pennsylvania, Philadelphia, PA 19104, USA.
3 Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015, USA.

Accurate terrestrial glacial chronologies are needed for comparison with the marine record to establish the dynamics of global climate change during transitions from glacial to interglacial regimes. Cosmogenic beryllium-10 measurements in the Wind River Range indicate that the last glacial maximum (marine oxygen isotope stage 2) was achieved there by 21,700 ± 700 beryllium-10 years and lasted 5900 years. Ages of a sequence of recessional moraines and striated bedrock surfaces show that the initial deglaciation was rapid and that the entire glacial system retreated 33 kilometers to the cirque basin by 12,100 ± 500 beryllium-10 years.

Submitted on December 21, 1994
Accepted on March 6, 1995


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