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| Together with Prof. Nakamori, Shiraishi investigated the reef deposits found on Amami Oshima. We discovered structures that could be called coralline algae reefs. | |
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| Calcareous green algae such as Halimeda and Dasyclads were also commonly seen. | |
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| We were also able to observe accretionary complex components that form the base of the island, such as basalt and melange. | |