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The Middle-Upper Pleistocene Shibikawa and Katanishi Formations exposed at the Anden Coast, Oga Peninsula, Akita Prefecture consist of shallow marine and nonmarine sediments. Authors divided these sediments into eight sedimentary facies based on their grain size, sedimentary structure and fossil assemblage, and postulated depositional environments and depths of these facies. Temporal variations of depositional depth are reconstructed at the Anden Coast according to successional change of facies along the exposure, and they are compared with the standard oxygen isotope curve by using widespread marker tephra layers as age control datums. Consequently, six sedimentary cycles caused by glacio-eustatic sea-level changes are recognized in the Middle to Upper Pleistocene deposits at the Anden Coast. The correlation between depth change and standard oxygen isotope curve allows more detailed estimation of the age for each sedimentary cycles. Based on the cyclostratigraphy, the stratigraphic divisions and boundaries at the Anden Coast must be re-defined.

Cyclostratigraphy of the upper Quaternary shallow-marine sediments at the Anden Coast, Oga Peninsula