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Internal structure and origin of the double reefs of North Bohol and the Olango reef flat (Philippines)

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Citation:
Grobe, H. , Willkom, H. and Wefer, G. (1985): Internal structure and origin of the double reefs of North Bohol and the Olango reef flat (Philippines) , The Philippine Scientist, 22 , pp. 83-94 .
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Abstract:

Nine holes were drilled with a submersible hydraulic drill into the slopes and reef flats of the Caubyna 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 Caltituban reefs were formed within the last 6,000 years. Corals settled on a pre-existing relief prallel 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.

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