Approximately the last 63 million years.
1 They were the dominant land animals of their time, just as the quadrupeds were during the Age of Mammals .
2 We think we're at the end of the Age of Mammals , and well into the Age of Managing the Ecology.
3 From between the feet of stomping dinosaurs, ratty animals scurry about; cue an asteroid impact and the Age of Mammals begins.
4 Thus, since vertebrates appeared, we have in succession the Age of Fishes, the Age of Amphibians, the Age of Reptiles, and the Age of Mammals .
5 At twenty-one minutes to midnight they vanish and the age of mammals begins.
6 Hence the Tertiary period may be called "the age of mammals . "
7 Still higher, or more recent, are Cuvier and Brongniart's tertiary rocks, representing the age of mammals .
8 Then came the Caenozoic age , or age of mammals , three million years, with strata thirty-one hundred feet thick.
9 The age of mammals awaited the deepening and the enrichment of the soil and the stability of the earth's crust.
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