But samples of organic materials taken from every rock layer, such as fossils, coal, limestone, natural gas, and graphite, all have measurable radiocarbon.
Radiocarbon dating estimates can be obtained on wood, charcoal, marine and freshwater shells, bone and antler, and peat and organic-bearing sediments.
They can also be obtained from carbonate deposits such as tufa, calcite, marl, dissolved carbon dioxide, and carbonates in ocean, lake and groundwater sources.
Each sample type has specific problems associated with its use for dating purposes, including contamination and special environmental effects.
More information on the sources of error in carbon dating are presented at the bottom of this page.
Once creatures die, the radiocarbon in their bodies should quickly break down.
After millions of years, their remains would be completely free of radiocarbon.
Since a blank sample holder in the AMS instrument predictably yields zero radiocarbon, these scientists should naturally conclude that the radiocarbon is “intrinsic” to the rocks.
In other words, real radiocarbon is an integral part of the “ancient” organic materials.
This finding is consistent with the belief that rocks are only thousands of years old, but the specialists who obtained these results have definitely not accepted this conclusion. To keep from concluding that the rocks are only thousands of years old, they claim that the radiocarbon must be due to contamination, either from the field or from the laboratory or from both.