Major Events in Geologic Time

Pre-Cambrian
- Most simple organisms lived in the water. (4000 million years ago)

Paleozoic Era
- 1st fossils of fish (505-438 million years ago)
- 1st fossils of land plants (438 - 408 million years ago)
- 1st fossils of amphibians/ animals that can live on land. (408-360 million years ago)
- All land masses joined to form a single supercontinent called Pangea (286 - 245 million years ago)


Mesozoic Era
-1st dinosaurs (245 - 208 million years ago)
-Dinosaurs become extinct (144 - 66.4 million years ago)


Cenzoic Era
-Mammals become dominant land animals(66.4 - 57.8 million years ago)
-Humans appear for the first time (5.3 - 1.6 million years ago)
-Ice Age (1.6 - 0.01 million years ago)
-Modern Civilization Develops (0.01 - present)

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