Part of my PhD thesis research dealt with radiocarbon dating of records extending back to the time of the last glacial maximum. Included were: the record of sea level contained in the sediments of the Mississippi River delta, the record of the reappearance of the planktonic foraminifera, G. menardii, in the Atlantic after an absence during glacial time and the record of the fluctuations in area of Nevada’s closed basin, Lake Lahontan. In all three of these records, I noted that a marked transition from glacial to interglacial conditions occurred close to 11,000 14C years ago. This finding...

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