Accuracy fossils dating methods
The sequence of fossils in the rocks more or less tells us the story of the history of life, and we have sensible ways of dealing with uncertainty.
It shows that both the preservation of rock and the preservation of fossils were probably driven by external environmental factors like climate change and sea level.As a result, all of the argon-40 in a volcanic rock sample is assumed to date from that time.When a fossil is sandwiched between two such volcanic deposits, their potassium-argon dates provide a minimum and maximum age.Methods have been developed to try to identify and correct for bias in the fossil record but new research from the Universities of Bristol and Bath, suggests many of these correction methods may actually be misleading.The study, led by Dr Alex Dunhill, formerly at the Universities of Bristol and Bath and now at the University of Leeds, explored the rich and well-studied fossil record of Great Britain.
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The results show that out of all the geological factors, only the area of preserved rock drives biodiversity.