The tropical reef ecosystems are created by living organisms,such as corals and algae,and provide important habitats for mil-lions of people and a variety of marine life,which have been severely threatened by climate changes over the past decades[1].These biogenic reefs account for a quarter of global CaCO3 pro-duction and thus are critical to global carbon cycling[2,3].To assess the evolution of present reef ecosystems in the context of global warming,carbonate banks in the Western Pacific and the Indian Ocean offer such an opportunity from a long-term perspec-tive under distinct climate conditions[4-6].Some biogenic reef sequences have been studied recently in terms of biological,pale-omagnetic,and strontium isotopic data[5-8];however,as a funda-mental issue in sedimentary and paleoenvironmental researches,the precise geochronology for biogenic reefs remains sparse,pre-venting our understanding of the low-latitude marine processes and the integration of marine and terrestrial climate changes.