Usage of "BP"
The BP scale is sometimes used for dates established by means other than radiocarbon dating, such as stratigraphy.
This usage differs with the recommendation by van der Plicht & Hogg, followed by the Quaternary Science Reviews, both of which requested that publications should use the unit "a" and reserve the term "BP" for radiocarbon estimations.
Some archaeologists use the lowercase letters bp, bc and ad as terminology for uncalibrated dates for these eras.
Read more about this topic: Before Present
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