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Potsdam Group :: Potsdam group () A subdivision of the Primordial or Cambrian period in American geology; -- so named from the sandstone of Potsdam, New York. See Chart of Geology..

Harlech Group :: Harlech group () A minor subdivision at the base of the Cambrian system in Wales.

Cambrian :: Cambrian (a.) Of or pertaining to Cambria or Wales.

Primordial :: Primordial (a.) Of or pertaining to the lowest beds of the Silurian age, corresponding to the Acadian and Potsdam periods in American geology. It is called also Cambrian, and by many geologists is separated from the Silurian..

Cambrian :: Cambrian (n.) A native of Cambria or Wales.

Cambrian :: Cambrian (n.) The Cambrian formation.

Ordovician :: Ordovician (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..

Taconic :: Taconic (a.) Designating, or pertaining to, the series of rocks forming the Taconic mountains in Western New England. They were once supposed to be older than the Cambrian, but later proved to belong to the Lower Silurian and Cambrian..

Longmynd Rocks :: Longmynd rocks () The sparingly fossiliferous conglomerates, grits, schists, and states of Great Britain, which lie at the base of the Cambrian system; -- so called, because typically developed in the Longmynd Hills, Shropshire..

Cambrian :: Cambrian (a.) Of or pertaining to the lowest subdivision of the rocks of the Silurian or Molluscan age; -- sometimes described as inferior to the Silurian. It is named from its development in Cambria or Wales. See the Diagram under Geology.

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