'Laurentian period' definitions:

Definition of 'Laurentian period'

From: GCIDE
  • Laurentian \Lau*ren"tian\, a. Pertaining to, or near, the St. Lawrence River; as, the Laurentian hills. [1913 Webster]
  • Laurentian period (Geol.), the lower of the two divisions of the Arch[ae]an age; -- called also the Laurentian. [1913 Webster]