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lower carboniferous period is a noun meaning "from 345 million to 310 million years ago; increase of land areas; primitive ammonites; winged insects". It carries one recorded sense.
from 345 million to 310 million years ago; increase of land areas; primitive ammonites; winged insects
Definitions, synonyms and semantic relations for lower carboniferous period come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.