大阪堆積盆地の更新世海成粘土層・Ma11層における Pseudopodosira kosugii の出現
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概要
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Pleistocene marine clay layer Ma11 in the Osaka sedimentary basin is correlated with marine oxygen isotope stage (MIS) 7. We analyzed fossil diatom assemblages and sedimentary sulfur in core sediments including the Ma11. Pseudopodosira kosugii, which is known as a useful indicator of past sea levels during the Holocene, was present in the uppermost part of the marine facies, which formed as a result of the marine transgression during MIS 7. Therefore, the abundance peaks of this species can also be used to reconstruct sea-level variations in sediments of pre-Holocene age.
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