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West of the Taconian/Acadian foreland basin, two cratonic structural basins developed in future lower Michigan and north-central Ohio.

Probably caused by transmitted orogenic stress.

Subsided with concurrent filling throughout the Paleozoic, deepening up to 16,000 feet in Michigan.

Collected sand and carbonate deposits during the Cambrian and Ordovician.

Accumulated muddy carbonates within encircling barrier reefs during the Early and Middle Silurian.

By the Late Silurian, marine and evaporite deposits alternated because the enclosing reefs often blocked the connection to the ocean.

Thick deposits of anhydrite and halite formed.

Silurian

Page 25

Michigan and Northern Ohio Basins

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