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Laurentian

(lô ren′s̸hən)

adjective

of or relating to the St. Lawrence River
designating or of a series of rocks of the Precambrian system in E Canada

Origin: < L laurentius, Lawrence + -an

See Laurentian in American Heritage Dictionary 4

adjective

Of, relating to, or being in the vicinity of the St. Lawrence River.
Geology Of or relating to the Precambrian gneissic granite of the Lake Superior area.

Origin:

Origin: From Latin Laurentius, Lawrence

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