The three resultant histograms show that each region has a very similar distribution of peaks and troughs that correlate with changes in slope of the tree ring calibration curve. attributed this finding to Stochastic Calibration Distortion (SCD) and not human activity. Graph of calibrated dates on charcoal and wood for New Zealand prehistory (A) compared with graphs of calibrated dates on charcoal for South Australia (B) and British Columbia (C) prehistory. (1994, Radiocarbon, Vol.36 No.2, p.221-236), tested the tree ring curve by plotting the frequency of C14 BP measurements from a random selection of charcoal and wood specimens (BP –100 to –1400 years) from New Zealand, Australia and British Columbia against their estimated BP calendar age (Figure 1).C BP age are used to determine calendar age ranges from the tree ring calibration curve.All the parchment samples are from the Beinecke Library and were analyzed by the U. The ages of samples (1-4) are known, the Vinland map has been dated to ~1434.
The 1SD error in the mean BP calendar estimate for the VM is 8.5 years.
The 1SD error in the C BP age is 8.5 * 2.77 or 24 years.
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