A carbonate mud mound in Indiana displays three main zones: a lower fossiliferous dolosiltite zone representing a core probably formed below wave base; a middle zone, consisting of algal-constructed and brecciated dolomite formed in an agitated environment; and an upper fossiliferous dolosiltite zone formed above wave base. Exposures indicate transition between carbonate mud mounds and true wave-resistant stromatoporoid- and coral-controlled reefs. A spongiostromid algal cap has been discovered on a mud mound.

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