REEFS. Kelly Lekan. Early Reefs. First appearance of reefs around 570 million years ago. The first reefs formed were made of cyanobacteria. Were found living around 3.5 billion years ago Reefs formed by trapping in sediment, and secreting calcium carbonate Formed stromatolites
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Work together in a symbiotic relationship to build reefs
Corals live in colonies
Secrete a hard exoskeleton of calcium carbonate which serves as a base for the reef
Reefs build by the deposition of calcium carbonate
Upper layer is the living layer of the polyps, and when calcium carbonate is secreted, it leaves behind another layerReef Formation