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The oldest Phanerozoic reefs were built in the Early Cambrian (Sauk I) by a consortium of calcimicrobes and archaeocyaths, with the calcimicrobes being the critical reef-building organisms. Archaeocyath-Kena/c/s reefs first occur at the base of the Tommotian Stage on the Siberian Platform; these are cavernous, framework pinnacle reefs about two meters in diameter, with constructor, baffler, and dweller guilds already present. Throughout the rest of the Early Cambrian, archaeocyath-calcimicrobe reefs spread around the world into a variety of low-latitude, mostly shallow-water settings, including shelf margin-oolite shoal environments and inner-shelf settings, often with considerable siliciclastic sediment present. Many Early Cambrian...

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