Giem
[18] reviewed the literature and tabulated
about seventy reported AMS measurements
of 14C in organic materials from
the geologic record that, according to the conventional geologic time-scale, should be 14C ‘dead.’ The surprising result is that organic samples from every portion of the
fossil
record show detectable amounts of 14C.
For the measurements considered most reliable,
the 14C/C ratios appear to fall in the range 0.1-0.5 percent of the modern 14C/C ratio (percent modern carbon, or pmc).
0.1
percent modern carbon corresponds
to a computed age of 57,000
years!