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Noun: Upper Carboniferous period
  1. The period from 310 million to 280 million years ago; characterized by warm climate and swampy land
    - Pennsylvanian, Pennsylvanian period, Upper Carboniferous

Type of: geological period, period

Part of: Carboniferous, Carboniferous period

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upon one's guard
upper
Upper Avon
Upper Avon River
upper balcony
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upper bound
upper cannon
Upper Carboniferous
Upper Carboniferous period
upper class
upper crust
upper deck
Upper Egypt
upper hand
upper jaw
upper jawbone
upper limit
upper mantle
Upper Normandy