In the early Cenozoic era, after the dinosaurs became extinct, the number and diversity of mammals exploded. In just 10 million years -- a brief flash of time by geologic standards -- about 130 ...

3 min read At the dawn of the Paleogene—the beginning of the Cenozoic era—dinosaurs ... Rodent-size (and perhaps larger) mammals emerged, suddenly free to fill the void.

For most of the Cenozoic era, local and continental measures of ... Then, around 56 million years ago, we get this massive immigration of mammals into North America from other continents, and ...

and once belonged to a lineage of sharks that evolved during the Cenozoic era, becoming increasingly specialized for preying on and scavenging marine mammals. Its reputation as a ruthless apex ...