All of the known Tournaisian-early Visean (ca. 360-348 Ma) age carbonate mud mounds (Waulsortian and Waulsortian-like mounds) developed in low paleolatitudes on the southern shelf margin of Laurussia and in the Laurussian interior seaway. The Tournaisian-early Visean geography probably prevented hurricanes, tropical storms, and winter storms from crossing the shelf margin or interior seaway where these mounds developed. Implications of the lack of storm energy on mound development are discussed.

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