Eastern North American rifts lacustrine complexes

Eastern North American rifts lacustrine complexes. Regional variations in the character of lacustrine sequences in the eastern North American rift basins are related to south-to-north humid-to-arid transition. The Richmond-type complex represents the humid end member; the Fundy-type complex represents the arid end member; the Newark-type complex is intermediate between the two. Modified from Olsen (1990).