Abstract
Radiocarbon dates have been obtained on samples of marine bivalve shells and lake mud collected by the author. The dating has been carried out at the folIowing three institutions: 1) The C14-laboratory at the National Museum, Copenhagen, by H. Tauber (samples marked K); 2) Department of chemistry at the University of Washington, U.S.A., by A. W. Fairhall (samples marked UW); 3) Isotopes Inc., Westwood, New Jersey, U.S.A. (samples marked I). The dates are expressed as uncorrected C14 years based on the conventional half life for C14 of 5570 years. In the dating of bivalve shelIs the surface material of the shelIs has been removed prior to analysis.

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