Divisions of an era are called Periods.
Precambrian Era, Paleozoic Era, Mesozoic Era, Cenozoic Era
provinces and territories
The two basic divisions following the Precambrian on the geologic time scale are the Paleozoic Era and the Mesozoic Era. These eras are further divided into periods, such as the Cambrian, Devonian, and Permian in the Paleozoic Era, and the Triassic, Jurassic, and Cretaceous in the Mesozoic Era.
counties
Eon, Era, and Epoch: APEX :D
Interphase
Partitions divide hard drive space.
I would call it the anthrozoic era, but generally named the Cenozoic
Bobby Zamora
Mesozoic
they were the cretatious triassic and jurassic
Eon - Phanerozoic (most distant) Era - Cenozoic Period - Quaternary Epoch - Holocene (most recent)