designating or of the geologic eon usually subdivided into the Paleozoic, Mesozoic, and Cenozoic eras
See Phanerozoic in American Heritage Dictionary 4
(fănˌər-ə-zōˈĭk)
adjective
Of or relating to the geologic time period from approximately 570 million years ago to the present, comprising the Paleozoic, Mesozoic, and Cenozoic eras, and marked by an abundance of fossil evidence of life, especially higher forms, in the corresponding rocks. See Table at geologic time.