Contributor USGS
Major Divisions of Geologic Time is a table showing the four eras (Precambrian through Cenozoic) and 12 periods (Cambrian through Quaternary). It includes brief explanations of how each period was named. No dates are included.
Major Divisions of Geologic Time is a table showing the four eras (Precambrian through Cenozoic) and 12 periods (Cambrian through Quaternary). It includes brief explanations of how each period was named. No dates are included.
Contributor USGS
ACTIVITY MODULE
Sixth grade, Seventh grade, Eighth grade
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