Palaeozoic

/ (ˌpælɪəʊˈzəʊɪk) /

adjective

of, denoting, or relating to an era of geological time that began 600 million years ago with the Cambrian period and lasted about 375 million years until the end of the Permian period

noun

the Palaeozoic the Palaeozoic era

Word Origin for Palaeozoic

C19: from palaeo- + Greek zōē life + -ic

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for palaeozoic

This last state is very frequent in Blattidae, which were amongst the most abundant of Palaeozoic insects.
Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 4|Various
Carboniferous beds occur in the north of the Palaeozoic area.
Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 5|Various
Other Palaeozoic systems are, however, included in the folds.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 7|Various
They are known to be pre-Jurassic, but whether they are Palaeozoic or Archaean is uncertain.
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2|Various

Occur exclusively in Palaeozoic strata from Devonian upwards.
Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6|Various