古こ生せい界かいMeanings1nounPaleozoic groupGeological term referring to the group of strata from the Paleozoic era. Used in earth science contexts.この地ち域いきの古こ生せい界かいからは多おおくの化か石せきが産さん出しゅつする。Many fossils are found in the Paleozoic group of this region.