In article ,
Eric Miller wrote:

. . . 15 genera extinctions can be reliably
attributed to a brief interval of 11,500 to 10,000 radiocarbon years
before present, shortly following the arrival of the Clovis people in


Are "radiocarbon years" different from say, Earth years?

Eric Miller
www.dyesscreek.com

Isotope Carbon 14 is radio-active, which is to say their is a period of
time that it takes for half of it to decay (it's half life) and by
adding up the decay products you can approximate fairly closely how long
it has been decaying.

http://en.wikipedia.org/wiki/Radiocarbon_dating

Radiocarbon dating is a radiometric dating method that uses the
naturally occurring isotope carbon-14 (14C) to determine the age of
carbonaceous materials up to about 60,000 years.[1] Raw, i.e.
uncalibrated, radiocarbon ages are usually reported in radiocarbon years
"Before Present" (BP), "Present" being defined as AD 1950. Such raw ages
can be calibrated to give calendar dates.
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Billy

Impeach Pelosi, Bush & Cheney to the Hague
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