Usually means: Late phase of Carboniferous period.
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We found 11 dictionaries that define the word upper carboniferous:

General (10 matching dictionaries)
  1. Upper Carboniferous: American Heritage Dictionary of the English Language
  2. Upper Carboniferous: Vocabulary.com
  3. Upper Carboniferous: The Wordsmyth English Dictionary-Thesaurus
  4. Upper Carboniferous: Infoplease Dictionary
  5. upper carboniferous: Dictionary.com
  6. Upper Carboniferous: Wikipedia, the Free Encyclopedia
  7. Upper carboniferous: Rhymezone
  8. upper carboniferous: FreeDictionary.org
  9. upper carboniferous: Mnemonic Dictionary
  10. Upper Carboniferous: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. Upper Carboniferous: Encyclopedia

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Definitions from WordNet (Upper carboniferous)

▸ noun:  from 310 million to 280 million years ago; warm climate; swampy land


Opposite:
lower carboniferous, mississippian

Phrases:
upper carboniferous period, more...

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Opposite:
lower carboniferous, mississippian

Phrases:
upper carboniferous period, more...




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