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- a. - Of or pertaining to, or designating, the older division
of geological time during which life is known to have existed,
including the Silurian, Devonian, and Carboniferous ages, and also to
the life or rocks of those ages. See Chart of Geology.
- noun - From 544 million to about 230 million years ago
- - Of or relating to or denoting the Paleozoic era
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