Posted on 05/22/2010 7:49:33 AM PDT by SunkenCiv
I may be remembering this wrong, but I think BP which means Before Present, not British Petroleum in this context, counts back from 1950. After this date carbon 14 dating ran into difficulties because of Atomic Bomb effects and other nuclear radiation. So 100 years BP would be 1850 if I am correct.
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