DISTANCE [cm] is the distance from rim. For each specimen the first value represents the age of the outermost layer of the skeleton, taken as equal to the sampling year. Sample Pb19-14C is the radiocarbon bomb spike fit described in the text. Distance from rim was measured along the growth axis. Year A.D. is calculated from the age and the year of the measurements (varying from 1997 to 2001 A.D.). Uncertainties of the U-Th dates are internal errors (2 sd) except for sample Ce96-4'. For this sample multiple analyses (n = 5) give an error of about 4% (2sem).