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Which marine organisms built many Devonian reefs?
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Devonian Period
Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the early Devonian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.
During the Devonian Period, many marine reefs were primarily built by stromatoporoids and corals.12
Stromatoporoids, which were large colonial marine organisms similar to hydrozoans and functioned as a type of sponge with a layered calcium carbonate skeleton, were particularly significant as rock builders in the mid-Devonian of the Northern Hemisphere. Corals also played an essential role in constructing reef facies, including both tabulate corals (such as Favosites and Alveolites) and rugose corals (horn corals). In some regions, reefs were also formed by mud mounds or, following the decline of stromatoporoids near the end of the Frasnian Age, by cyanobacterian stromatolites.12