Definitions for upper carboniferous
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Princeton's WordNet
Pennsylvanian, Pennsylvanian period, Upper Carboniferous, Upper Carboniferous period(noun)
from 310 million to 280 million years ago; warm climate; swampy land
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"upper carboniferous." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/upper carboniferous>.

