The geological period from 280 million to 310 million years ago; it was characterized by a warm climate and abundance of swampy land.
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"Pennsylvanian" Quotes from Famous Books — Perley's Reminiscences, Vol. 1-2 - of Sixty Years in the National Metropolis • Benjamin Perley Poore |
Words linked to "Pennsylvanian" : carboniferous, Upper Carboniferous, Pennsylvanian period, period, Upper Carboniferous period |
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