The timescale includes revisions by D. A. Meese as of September 1994. The GISP2 depths below 167 meters are those of the D core; above 167 meters the core depths are those of the B core + 1.09 meters. d18O measured at Quaternary Isotope Laboratory, University of Washington. layer count ages at top depths (in kyr BP) where 0 BP represents AD 1950 SUMMER to AD 1949 SUMMER. Depth is top of interval
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