(I would be delighted beyond words if scientists had already begun dating pterosaur fossils through radiocarbon methods, but it appears we need to wait for that.) Shellac contamination?
A 1990 experiment that involved radiocarbon dating of pieces from two dinosaur bones—that test will not be covered, for it involved a controversy regarding a report of shellac that may have contaminated one of the two sample sources.
By taking a carboniferous specimen of known age (that is, a specimen which we are able to date with reasonable certainty through some archaeological means), scientists are able to determine what the ratio was during a specimen's lifetime.They are then able to calibrate the carbon dating method to produce fairly accurate results.Carbon dating is thus accurate within the timeframe set by other archaeological dating techniques. In order for carbon dating to be accurate, we must know what the ratio of carbon-12 to carbon-14 was in the environment in which our specimen lived during its lifetime.during the industrial revolution more carbon-12 was being produced offsetting the ratio a bit). Furthermore, the ratio is known to fluctuate significantly over relatively short periods of time (e.g.