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Major Events in Geologic Time

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Major Events in Geologic Time Answer Key

Order the major events in Earth's history from 1, earliest, to 15, the most recent.


7 Age of Amphibians

13 Early hominids appear

3 One-celled organism appear

1 Formation of Earth

14 Mass extinction of mammals at end of last ice age

9 Early mammals and dinosaurs appear

5 Cambrian explosion

10 Supercontinent Pangaea beings to break apart

2 Age of oldest known rocks

12 Mammals diversify and flourish

8 Permian-Triassic mass extinction

15 Present Day

6 Earliest life on land

4 Sponges and other multi-celled animals appear

11 Cretaceous-Tertiary mass extinction
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