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| A depiction of what Eohippus may have looked like |
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| Teritiary Earth |
The Tertiary Period lasted from 65 to 1.8 mya. Climates during the Tertiary slowly cooled, with moderate worldwide temperatures, ending before the first extensive glaciation at the start of the Quaternary. This period ended with the start of the most recent Ice Age. The plants of the Tertiary Period were similar to the plants that we have today. The warm climate at the beginning favored dense forests. As the climate cooled, open woodlands and grasslands became abundant. The grasses supported huge herds of grazing animals. One distinct mammal that appeared in this Period is Eohippus, the ancestor of the modern horse.
