Palaeozoic era
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Related to Palaeozoic era: Mesozoic era, Cenozoic era
Palaeozoic era
an era of 350 million years duration, from the beginning of the CAMBRIAN PERIOD to the end of the PERMIAN PERIOD, lasting from 590 to 240 million years ago.Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005