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The noun GEOLOGICAL ERA has 1 sense: 1. a major division of geological time; an era is usually divided into two or more periods. Familiarity information: GEOLOGICAL ERA used as a noun is very rare.ge 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). Holonyms (geological era is a part of...): aeon; eon (the longest division of geological time).
1. (Geological Science) of, denoting, or formed in the most recent period of geological time, which succeeded the Tertiary period nearly two million years ago. n. 2. (Geological Science) the Quaternary the Quaternary period or rock system, divided into Pleistocene and Holocene (Recent) epochs or series.