Abstract
Each set of C-14 age versus depth data in the recent investigation was analyzed using cubic regression for a smooth curve representation of the average data trend. The analysis was limited to profiles which were described by at least 7 data pairs, with the exception of 3 continental sediment and 2 peat profiles, each of which has 6 well-spaced, precisely determined data points. Profiles for which a cubic regression with a Coefficient of Determination (CRCD) of at least 0.70 could not be obtained were not included in the group analysis. Six continental sediment and 5 soil profiles failed to meet the 0.70 CRCD criterion. Sixteen continental sediment, 5 soil, and 9 peat profiles that met the 0.70 CRCD criterion were rejected on the basis of clear evidence that the feature had been disturbed during or since emplacement, or because the data range was too restricted to establish adequately a representative trend. Of the profiles, 170 sediment, 114 peat, and 25 soil survived these restrictions.