From 310 million to 280 million years ago; warm climate; swampy land. Synonyms: Pennsylvanian period, Upper Carboniferous, Upper Carboniferous period.
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"Pennsylvanian" Quotes from Famous Books — The Atlantic Monthly, Volume 20, No. 122, December, 1867 • Various |
Words linked to "Pennsylvanian" : geological period, carboniferous, American, Carboniferous period, period, Upper Carboniferous period, Keystone Stater |
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