Geologic History: The Geologic Time Scale

Section Objectives Icon Section Objectives

After you have completed this section, you will be able to:

  1. Discuss how the geologic time scale was developed.
  2. Construct and describe a geologic time scale.
  3. Discuss the major events of each geologic eon and the eras of the Phanerozoic.
  4. Correlate rock units and know how to assign ages to rock formations.
  5. Use geologic maps to relate Earth structures to times of the geologic time scale.