Hi Paul -
The problem with the Indiana dates is that they were calibrated using a global
calibration curve, when it is now demonstrated beyond doubt that there are
significant regional variations caused by some neutron sources.
It is not known if these sources were impacts or supernova.
Late dates from Pribilov would not be surprising, given the late dates from
Wrangle. There could be very good explanations for these, or again they may be
erroneous dates caused by some neutron source. (Perhaps one connnected with the
effects of the Earth's magnetic field, but who knows?)
E.P. Grondine
Man and Impact in the Americas
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