The Collaborative International Dictionary
Mammal \Mam"mal\, n.; pl. Mammals. [L. mammalis belonging to the breast, fr. mamma the breast or pap: cf. F. mammal.] (Zo["o]l.) One of the Mammalia.
Age of mammals. See under Age, n., 8.
Usage examples of "age of mammals".
This was also the start of the so-called Tertiary period, or Age of Mammals, so the end of the dinosaurs is usually called the K/T boundary, 'K' because Germans spell Cretaceous with a K.
Eventually, this would prove their salvation, but they would have to wait nearly 150 million years for Megadynasty 3, the Age of Dinosaurs, to come to an abrupt end and make room for Megadynasty 4 and our own Age of Mammals.
The age of mammals began, leading ultimately to the earliest hominids.
The age of mammals began, leading ultimately to the earliest homi-nids.
Of course then the dinosaurs faced their own extinction at the end of the Mesozoic, ushering in the Age of Mammals, misnomer which that is.