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| Geologic Time | Paleozoic Era | Mesozoic Era | Cenozoic Era | The Geologic Time Scale The study of the Earth from the beginning of time to the present has been the task of geologists who attempt to unravel the events that have shaped our planet as it is today. The Earth carries the history of geological events in its rock layers.
Rating Newest Oldest. Best Answer: The geologic time scale is based on the principle of superposition of strata. That is, in undisturbed layers of strata, the older strata will be underneath the younger. There are an enormous number of strata that have been laid down over the billions of years in which the earth has existed.