Paleozoic

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Related to Palaeozoic Era: Mesozoic era, Cenozoic era

Paleozoic

[¦pāl·ē·ə¦zō·ik]
(geology)
The era of geologic time from the end of the Precambrian (600 million years before present) until the beginning of the Mesozoic era (225 million years before present).
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The conodonts were small, eel-shaped animals without any vertebral column, which measured a few tenths of a millimetre in length, and inhabited the seas during the Palaeozoic era and became extinct at the end of the Triassic (around 205 million years ago).
However, if we add Palaeozoic tubeworms of lophophorate affinities to this record, the shelly faunas of the Palaeozoic era may have been even more dominated by lophophorates than previously thought.
The Ice Age occurred in the Ordovician and Silurian Periods of geological time (part of the Early Palaeozoic Era), an interval that witnessed a major diversification of early marine animals including trilobites and primitive fish as well as the emergence of the first land plants.