Dating rocks and fossils and geologic events

21-Apr-2019 00:20

Particularly useful are index fossils, geographically widespread fossils that evolved rapidly through time.Crosscutting Relationships: Relative ages of rocks and events may also be determined using the law of crosscutting relationships, which states that geologic features such as igneous intrusions or faults are younger than the units they cut across.For example, shells, wood, and other material found in the shoreline deposits of Utah’s prehistoric Lake Bonneville have yielded absolute dates using this method.These distinct shorelines also make excellent relative dating tools.

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Relative dating places events or rocks in their chronologic sequence or order of occurrence.

Geologists generally know the age of a rock by determining the age of the group of rocks, or formation, that it is found in.