HyperDic: pennsylvanian_period

English > 1 sense of the expression Pennsylvanian period:
NOUNtimePennsylvanian period, Pennsylvanian, Upper Carboniferous, Upper Carboniferous periodfrom 310 million to 280 million years ago
English > Pennsylvanian period: 1 sense > noun 1, time
MeaningFrom 310 million to 280 million years ago; warm climate; swampy land.
SynonymsPennsylvanian, Upper Carboniferous, Upper Carboniferous period
Instance ofperiod, geological periodA unit of geological time during which a system of rocks formed
Part ofCarboniferous, Carboniferous periodFrom 345 million to 280 million years ago

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