Abstract

Although Paleozoic stromatoporoids were drastically reduced in abundance and diversity by the Frasnian-Famennian (F/F) mass extinction event, at least 20 genera (mostly labechiids and clathrodictyids) are known from latest Devonian rocks. Some typical Frasnian genera survived the F/F crisis to die out in early Famennian time, and others took part in the Strunian resurgence of the stromatoporoids. Small stromatoporoid reefs are known from Famennian and Strunian rocks. The history of the group suggests a large, rapid, but progressive environmental change at the F/F boundary and the survival of genera better adapted to cool water.

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