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the Paleozoic, Mesozoic and Cenozoic Eras) representing the period of Earth's history with advanced life forms, and the Pre Cambrian (or Proterozoic and Hadean Eras) representing the period before advanced life.Within the context of the Phanerozoic Eon, geologists beginning in the late 1700's recognized that fossils appeared in an orderly fashion in stratigraphic units.The Geologic Time Scale was originally laid out using relative dating principles.The geological time scale is based on the the geological rock record, which includes erosion, mountain building and other geological events.Moreover, these geologists recognized that the fossilized biota demonstrated rather large changes in overall composition and showed both similarities with, and differences from living taxonomic groups.

To discuss the model results for atmospheric oxygen levels over time, we thus need to refer to the geological timescale.

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.

The geological timescale began as a table of strata, with older strata beneath younger.

Gradually the fossil content of the strata defined the units.

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