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" ... The bioherm reef is believed to be about 8,000 years old, the same age as the coral of the Great Barrier Reef. Their mounds of ancient algae are a kind of geochemical archive, containing records of ocean temperature and acidity from the last Ice Age until now. The records can be used to understand how past ocean changes affected corals and other organisms, in order to predict how today's warming and acidifying oceans could affect future ecosystems. ... "