pennsylvanian period

Noun
  1. From 310 million to 280 million years ago;
    Warm climate;
    Swampy land (synset 115152459)
    is an instance of: geological period, period - a unit of geological time during which a system of rocks formed
    is a part of: carboniferous, carboniferous period - from 345 million to 280 million years ago
    same as: pennsylvanian, upper carboniferous, upper carboniferous period

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