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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).
Freebase(0.00 / 0 votes)Rate this definition: Geologic time scale. The geological time scale is a system of chronological measurement that relates stratigraphy to time, and is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships between events that have occurred throughout Earthâs history.