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The geologic time scale was developed after scientists observed changes in the fossils going from oldest to youngest sedimentary rocks. They used relative dating to divide Earth's past in several chunks of time when similar organisms were on Earth. Geologists conduct studies that locate rocks that contain important metals, plan the mines that produce them and the methods used to remove the metals from the rocks. They do similar work to locate and produce oil, natural gas, and groundwater.
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The geologic time scale (GTS) is a system of chronological dating that classifies geological strata (stratigraphy) in time.
The sequence of significant events on earth are how rocks have been changing over time.
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