Sections of the Geologic Timescale are Defined By

Question

Sections of the geologic timescale are defined by:
A) how close the rocks are to the surface of the earth.
B) whether the rocks are metamorphic or sedimentary.
C) the age of the rocks.
D) the kinds of fossils present.

Accepted Answer

The sections of the geologic timescale are defined by the kinds of fossils present in the rock layers. Different periods of time are characterized by different types of organisms that lived and became fossilized, allowing us to identify and name these time periods.