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The origins of the names vary. Some are named for areas in which rocks from that period are found. Some are named for characteristics of those rocks.
  • Cambrian: Cambria (Latin name for Wales)
  • Ordovician: Ordovices (a Celtic tribe)
  • Silurian: Silures (a Celtic tribe)
  • Devonian: Devon, England
  • Carboniferous*: "Coal-Bearing"
  • Permian: Permia (a Kingdom in what is now Russia)
  • Triassic: named for a group of three distinct rock beds in Germany.
  • Jurassic: the Jura Mountains, part of the Alps
  • Cretaceous: Creta ("chalk" in Latin)
  • Paleogene: "old"
  • Neogene: "new"
  • Quaternary: "fourth" (derived from a system where the Paleogene and Neogene were the Tertiary, the Mesozoic Era was the Secondary, and the Paleozoic was the Primary).
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