Radiometric dating decay curves

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The above Table 2 from Palaeo 122(1996)p.114 summarizes published data concerning one proposed event, the termination of the Younger Dryas period, and illustrates the range of dating errors from various sources including tree rings, lake varves, coral dating and the Greenland ice cores. Conclusion: The apparent close correlation of the dating results from multiple sources appears to be strong evidence for an earth much older than 10,000 years!At the extremes there is a range from 10,447 to 11,700 year B. And evidence that properly conducted C14 radiometric dating can approach reasonable accuracy, possibly within better than 10 percent.Each spring, tiny plants bloom in Lake Suigetsu, a small body of water in Japan.When these one-cell algae die, they drift down, shrouding the lake floor with a thin, white layer.Continuous lines show the German oak and pine chronologies fixed by comparison with the varve chronology of Lake Suigetsu.The combined 14C and varve chronologies from Lake Suigetsu are used to calibrate the 14C time scale beyond the range of the absolute tree-ring calibration.The sedimentation or annual varve thickness is relatively uniform (typically 1.2 mm yr-1 during the Holocene and 0.62 mm yr-1 during the Glacial).The age below 30.45 m depth is obtained by assuming a constant sedimentation in the Glacial (0.62 mm yr-1).

"In order to build up a calendar time scale (i.e., varve chronology) for the Suigetsu (SG) core, a total of 85 subsamples were taken in a section of SG extending from 10.43 to 30.34 m below the top sediment, each ca.

Based on the results of some duplicated countings of selected subsamples and independent counting of different subsamples collected from the same horizon, we estimate that the counting error is less than 1.5%, corresponding to 150 yr for 10,000 varve years.

From the laminated sediments we selected terrestrial-origin macrofossils such as leaves, branches and insects for AMS 14C measurements.

The uncertainty in the varve chronology comes from two sources: core sampling and varve counting. Since the varve ages from below 18 m (corresponding to ca.

Detailed comparison with short piston cores shows that the sampling does not cause significant loss of varves - typically 0-2 cm to a maximum of 3 cm, corresponding to ca. 20,000 cal BP) were estimated by varve counting of a single core, the ages quoted should be considered as minimum ages, the error increasing with depth.

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