geological era

Other forms: geological eras

Definitions of geological era

1. noun

   a major division of geological time; an era is usually divided into two or more periods
   synonyms: era

   examples:

   Age of Mammals

   approximately the last 63 million years

   Age of Reptiles

   the era of geologic time from about 252 to 66 million years ago; the second Phanerozoic era

   Paleozoic era

   the era of geologic time from about 541 to 252 million years ago; the first Phanerozoic era

   type of:

   geologic time, geological time

   the time of the physical formation and development of the earth (especially prior to human history)