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Thesaurus: ordovician

Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian.

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Definitions

  1. a. Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian.
  2. n. The Ordovician formation.
  3. Of or pertaining to a division of the Silurian formation, corresponding in general to the Lower Silurian of most authors, exclusive of the Cambrian. -- n. The Ordovician formation.
  4. Of or pertaining to a division of the Silurian formation,corresponding in general to the Lower Silurian of most authors,exclusive of the Cambrian.-- n.
  5. j:100 n. from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds