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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).
Phanerozoic (fÄn'Ér-É-zÅ'Ä­k) The period of geologic time from about 540 million years ago to the present, including the Paleozoic, Mesozoic, and Cenozoic Eras. When this period of time was first defined, it was thought to coincide with the first appearance of life in the fossil record. It is now known that bacterial and other forms of life were present in the Precambrian Eon, and the Phanerozoic is understood to coincide with the appearance of life forms that evolved external skeletons.