containing early evidence of animals
• (a.) Of or pertaining to rocks or strata older than the Paleozoic, in many of which the eozoon has been found.
E`o·zo'ic adjective [ See Eozoön .] (Geol.) Of or pertaining to rocks or strata older than the Paleozoic, in many of which the eozoön has been found. » This term has been proposed for the strata formerly called Azoic , and is preferred especially by those geologists who reg...
Eozoic Of or pertaining to rocks or strata older than the Paleozoic, in many of which the eozoon has been found.
(formerly) noting or pertaining to the Precambrian Era, esp. the period including the beginnings of animal life.