Carboniferous
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Carboniferous
of, denoting, or formed in the fifth period of the Palaeozoic era, between the Devonian and Permian periods, lasting for nearly 64 million years during which coal measures were formed
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
Carboniferous
[‚kär·bə′nif·ə·rəs] (geology)
A division of late Paleozoic rocks and geologic time including the Mississippian and Pennsylvanian periods.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.