geological era

1. A major division of geological time;
   An era is usually divided into two or more periods (synset 115272831)
   is a type of: geologic time, geological time - the time of the physical formation and development of the earth (especially prior to human history)
   specific instances:

   • age of mammals, cenozoic, cenozoic era - approximately the last 63 million years
   • age of reptiles, mesozoic, mesozoic era - from 230 million to 63 million years ago
   • paleozoic, paleozoic era - from 544 million to about 230 million years ago
   has: geological period, period - a unit of geological time during which a system of rocks formed
   is a part of: aeon, eon - the longest division of geological time
   same as: era

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