Geologic Time Scale Practice

Learning the Time Scale takes practice… so here's practice. Each time you try this, you will see different parts of the Time Scale blank. Your mission is to fill in the blanks.

Eon Era Period Actions


Number of blanks



World
North America, only
North America, only
[several Eras]
Earlier, unofficial Periods
[several Eras] Earlier, unofficial Periods
No official Eras or Periods

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