NOAA/NGDC, David Skaggs Research Center, 325 Broadway, Boulder, CO 80305 United States ; CIRES, University of Colorado, NOAA/NGDC, 325 Broadway, Boulder, CO 80305 United States
School of Earth and Environment, The University of Leeds, Leeds. LS2 9JT, Leeds, LS2 9JT United Kingdom
School of Earth and Environment, The University of Leeds, Leeds. LS2 9JT, Leeds, LS2 9JT United Kingdom
Southern Illinois University, College of Science, Department of Geology 4324, Southern Illinois University Carbondale, Carbondale, 62901-4324 United States
NOAA/NGDC, David Skaggs Research Center, 325 Broadway, Boulder, CO 80305 United States ; CIRES, University of Colorado, NOAA/NGDC, 325 Broadway, Boulder, CO 80305 United States
NOAA/NGDC, David Skaggs Research Center, 325 Broadway, Boulder, CO 80305 United States