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He noted that different formations contained different fossils and he could map one formation from another by the differences in the fossils.
After an organism has been dead for 60,000 years, so little carbon-14 is left that accurate dating can not be established.
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.
The earliest geological time scales simply used the order of rocks laid down in a sedimentary rock sequence (stratum) with the oldest at the bottom.
However, a more powerful tool was the fossilised remains of ancient animals and plants within the rock strata.
Divisions in the geological time scales still use fossil evidence and mark major changes in the dominance of particular life forms.