Sentences with phrase «14c kyr»

The 14C ages were corrected for mass - dependent fractionation with measured δ13C values, 33 and compared with samples of Pleistocene whale bone or calcite (backgrounds, > 48 14C kyr BP), late Holocene bison bone (∼ 1,850 14C BP), late AD 1800s cow bone and OX - 2 oxalic acid standards for calibration.