The Formosa reef limestone consists of a localized three-dimensional cluster of very pure, massive limestone reefs (bioherms) outcropping as irregular knobs in a roughly elliptical area in southern Bruce and northern Huron counties, Ontario. Outcrop and subsurface evidence indicates that the reefs are small, numerous, scattered over an outcrop area of about 150 square miles, and occur through a Stratigraphic interval of approximately 200 feet within the brown, bituminously laminated dolomite of the Detroit River group (undifferentiated), which is about 240 feet thick in the area.

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