Abstract

Four principle morphologic forms of cryptalgal structures are present in the dolomite rocks of the Detroit River Group in southwestern Ontario: domal stromatolites, polygonal stromatolites, and two types of cryptalgalaminate structures. These features in association with birdseye structures and molds of evaporite crystals strongly suggest that the rocks were deposited between the upper subtidal and lower supratidal zones of a hypersaline sea in the Michigan Basin.

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