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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).
The Cenozoic era is the geological time scale is divided into b â¦ oth periods and epoch. What is the geologic time scale that represents the longest time span? The geologic time scale that represents the longest time span is the eon. It is a unit of time that is equal to a billion years.