Why is carbon dating inaccurate after 50000 years
Then, we have wood for which we know the right answer.So, carbon dating has been calibrated against the rings of California bristlecone pines, and Irish bog oaks, and the like.As the name suggests, fossil fuel is old, and no longer contains C14.Both of these man-made changes are a nuisance to carbon dating.
(Specifically, neutrons hit nitrogen-14 atoms and transmute them to carbon.) Land plants, such as trees, get their carbon from carbon dioxide in the air. The same is true of any creature that gets its carbon by eating such plants. Suppose such a creature dies, and the body is preserved.
It is also standard to coat fossils during their extraction and transport.