Comment on 'Determination of the Radiocarbon Age of Parchment of the Vinland Map'

K R Ludwig
2002 Radiocarbon: An International Journal of Cosmogenic Isotope Research  
I wish to point out some statistical errors in the uncertainty calculations for the radiocarbon age of the Vinland Map (Donahue et al. 2002). First, the authors state that the 14C measurements of samples with chemical treatments B, C, D, and E "... result in consistent radiocarbon ages", and that "... two (of these analyses) are 1.5 sigma, and the others are one sigma or less, from the weighted average." In fact, the overall scatter of the data show that it is improbable that these data are
more » ... these data are statistically coherent, largely because analysis J21C lies 2.1 sigma from the weighted mean.
doi:10.1017/s0033822200031957 fatcat:t4luld2bdvfudcpuwvdep77mha