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Science 11 January 2002:
Vol. 295. no. 5553, pp. 310 - 313
DOI: 10.1126/science.1065494
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Reports
Direct Determination of the Timing of Sea Level Change During Termination II
Christina D. Gallup,1*
H. Cheng,2
F. W. Taylor,3
R. L. Edwards2
An outcrop within the last interglacial terrace on Barbados
contains corals that grew during the penultimate deglaciation, or
Termination II. We used combined 230Th and
231Pa dating to determine that they grew 135.8 ± 0.8 thousand years ago, indicating that sea level was 18 ± 3 meters
below present sea level at the time. This suggests that sea level had
risen to within 20% of its peak last-interglacial value by 136 thousand years ago, in conflict with Milankovitch theory predictions.
Orbital forcing may have played a role in the deglaciation, as may have isostatic adjustments due to large ice sheets. Other corals in the same
outcrop grew during oxygen isotope ( 18O) substage 6e,
indicating that sea level was 38 ± 5 meters below present sea
level, about 168.0 thousand years ago. When compared to the
18O signal in the benthic V19-30/V19-28 record at that
time, the coral data extend to the previous glacial cycle the
conclusion that deep-water temperatures were colder during glacial
periods.
1 Department of Geological Sciences, University
of Minnesota Duluth, Duluth, MN 55812, USA.
2 Minnesota Isotope Laboratory, Department of
Geology and Geophysics, University of Minnesota, Minneapolis, MN 55455, USA.
3 Institute for Geophysics, University of Texas
at Austin, Austin, TX 78712, USA.
*
To whom correspondence should be addressed. E-mail:
cgallup{at}d.umn.edu
Read the Full Text
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