What is pertaining to, or near, the St. Lawrence River; as, the Laurentian hills. Laurentian period (Geol.), the lower of the two divisions of the Archæan age; -- called also the Laurentian called?

laurentian — Pertaining to, or near, the St. Lawrence River; as, the Laurentian hills. Laurentian period (Geol.), the lower of the two divisions of the Archæan age; -- called also the Laurentian. (Webster's 1913.)

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