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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).
Of, relating to, or being the most recent era of geologic time, from about 66 million years ago to the present. The Cenozoic Era includes the Tertiary Period and the Quaternary Period and is characterized by the formation of modern continents, glaciation, and the diversification of mammals, birds, and plants. See Table at geologic time.