Paleozoic
Meaning
-
Of 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.
Pronounced as (IPA)
/ˈpeɪl.iəˌzəʊɪk/
Etymology
From paleo- + -zoic.
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