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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).
Cretaceous: The final geological period of the Mesozoic era that began 144 million years ago and ended 65 million years ago. The end of this period is defined most notably by the extinction of the dinosaurs in one of the largest mass extinctions ever to strike the planet.