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BTChronostratigraphic Units
 .Precambrian
 ..Ladoga Series
RTRussian Federation
 Finland
 Baltic Shield
 Karelia Russian Federation
SNUsed 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. (These units will be assigne