Answer: Geologic time
Step-by-step explanation:
The geologic time scale is the system of chronological dating of the past events that occurred on Earth. This identifies the chronological dating on the basis of geological strata that is by studying the layers or strata (stratigraphy) of soil or rocks and relating it with time. This method is used by the geologists, earth scientists, paleontologists to describe the relationship between the past events with respect to the time.