[sometimesp-] designating or of the geologic eon usually subdivided into the Paleozoic, Mesozoic, and Cenozoic eras
Origin of Phanerozoicfrom Classical Greek phaneros (see phanerogam) + -zoic
the Phanerozoic Eon or its rocks
Of, relating to, or being the geologic time period from approximately 542 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. geologic time
The Phanerozoic Eon.
Origin of PhanerozoicGreek phaneros visible ( from phainein to cause to appear ; see bhā-1 in Indo-European roots.) -zoic