TY - DATA ID - grobe1985rado T1 - Radiocarbon age determinations of coral and reef cores from the Philippines off North Bohol and Olango AU - Grobe, Hannes AU - Willkomm, Horst AU - Wefer, Gerold PY - 1985 T2 - Supplement to: Grobe, H et al. (1985): Internal structure and origin of the Double Reefs of North Bohol and the Olango Reef Flat (Philippines). The Philippine Scientist, 22, 83-94, hdl:10013/epic.11655.d001 PB - PANGAEA DO - 10.1594/PANGAEA.55293 UR - https://doi.org/10.1594/PANGAEA.55293 N2 - Nine holes were drilled with a submersible hydraulic drill into the slopes and reef flats of the Caubyan and Calituban reefs as well as of Olango Flat. The maximum depth of core penetration was 11 m. 14C ages showed that the Caubyan and Calituban reefs were formed within the last 6,000 years. Corals settled on a pre-existing relief parallel to the island of Bohol, building a framework for other carbonate-producing organisms. The reef flat south of Olango has a different structure. Formation took place during a Pleistocene high sea level, e.g. 125,000 years ago. ER -