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Scope Notes: Used for the Precambrian metamorphic unit in the Lake Ladoga region of the Russian Federation and Finland. Not to be confused with Quaternary deposits or Cambrian-Silurian sedimentary rocks of the same name in the same region. Before 1981, also search Ladoga Formation, Ladoga. Age may be Neoarchean or Paleoproterozoic. Added to Thesaurus in 1981.