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

See allHide authors and affiliations

Science  02 Jun 1995:
Vol. 268, Issue 5215, pp. 1329-1333
DOI: 10.1126/science.268.5215.1329


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.