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Once formations and stratigraphic sequences were mapped around the world, sequences could be matched from the faunal successions.

These sequences apply from the beginning of the Cambrian period, which contains the first evidence of macro-fossils.

For example, areas that were once deep oceans hundreds of millions of years ago are now mountainous desert regions.Finally, correlation between different isotopic dating methods may be required to confirm the age of a sample.For example, the age of the Amitsoq gneisses from western Greenland was determined to be 3.6 ± 0.05 million years ago (MA) using uranium-lead dating and 3.56 ± 0.10 Ma using lead-lead dating, results that are consistent with each other.After Charles Darwin's publication Origin of Species (Darwin himself was also a geologist) in 1859, geologists realised that particular fossils were restricted to particular layers of rock.This built up the first generalised geological time scale.Early Cambrian, Middle Cambrian and Late Cambrian).