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Re: [dinosaur] Size of the Chicxulub crater
On Fri, Jun 16th, 2017 at 9:51 PM, Thomas Richard Holtz <firstname.lastname@example.org> wrote:
> Yes, the 180 km is probably the most accurate, and current dating for the
> boundary is 66 Ma. Those who still use 65.5 or 65 have not kept up with the
> new dating techniques and results.
The date given by Renne et all in 2013 seems to have a surprisingly small
66.043 +/- 0.011 MYA. That would seem to narrow it down to within a 44,000 year
(at two standard deviations). Is Argon-Argon dating really that precise?
I worked as an archaeologist for many years, and I was used to seeing much
deviations on much more recent dates (C14, thermoluminescence, Uranium-Thorium,
Admittedly that was around the turn of the century, so technology may have (in
likely *has*) advanced somewhat since then. :-)