Since the third category has difficulty making any predictions regarding carbon-14 in fossil carbon, it will be ignored here, not because we know it to be wrong, but because it is untestable.
LONG-AGE THEORIES PREDICT NO CARBON-14 IN GEOLOGICALLY OLD SAMPLES In the first category long-age theories , some rather definite predictions can be made about samples that are assigned an age greater than 100,000 years.
More recent estimates (for example, Scharpenseel and Becker-Heidmann 1992) agree within a factor of 2.
Brown's estimate for carbon in the modern biosphere was 3.910 metric tons.
Certainly the carbon from all the coal in Flood strata, probably all the oil and possibly the natural gas, and an unknown percentage of all the limestone would have been in the biosphere.