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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.
Scientists have put together the geologic time scale to describe the order and duration of major events on Earth for the last 4 1 â 2 billion years. Some examples of events listed on the geologic time scale include the first appearance of plant life on Earth, the first appearance of animals on Earth, the formation of Earth's mountains, and the extinction of the dinosaurs.