adjective🔗ShareOf a geologic era within the Phanerozoic eon that comprises the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian periods from about 542 to 250 million years ago, from the age of trilobites to that of reptiles."My daughter is learning about the Paleozoic era in her Earth Science class, studying fossils of sea creatures from that ancient time. "geologyagetimehistoryscienceChat with AIVocabulary GamePractice Reading
