fieldmuseum.org
1. The Mesozoic Era was the era known as the age of the dinosaurs.
2. The Carboniferous Period was known for coal swamps.
3. The Ordovician Period was the first after the "explosion of life".
4. Modern humans first appeared in the Holocene Epoch.
5. The Permian Extinction.
6. The last Ice Ages in Michigan happened during the Pleistone Period.
7. Era, period, epoch
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