aEozoic(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 regard the eozoön as of organic origin. See Archæan.
Century Dictionary and Cyclopedia
eozoicOf or pertaining to the oldest fossiliferous rocks, such as the Laurentian and Huronian of Canada, from the supposition that they contain the first or earliest traces of animal life; paleozoic.
Webster's Revised Unabridged Dictionary
Such a great movement unquestionably closed the Eozoic period of geology.
"The Origin of the World According to Revelation and Science" by John William Dawson