Tropical mangrove pollen from the Middle Miocene Asakawa Formation, northern Ibaraki Prefecture, Northeast Japan

Calcareous nannofossil assemblages in mudstone samples from the Miocene Uchiono Formation exposed in Daigo Town, Ibaraki Prefecture, Japan, were examined for the depositional ages. Five samples obtained from four sites yielded calcareous nannofossils indicating CN3 or CN4 zones, which are dated to 17.65-13.60 Ma (early-middle Miocene). These results are consistent with previous studies of radiometric ages of pyroclastic rocks as well as diatom biostratigraphy.

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Tropical mangrove pollen from the Middle Miocene Asakawa Formation, northern Ibaraki Prefecture, Northeast Japan

Cited by 3 publications

References 14 publications

Development of the Tanakura strike-slip basin in Japan during the opening of the Sea of Japan: Constraints from zircon U–Pb and fission-track ages

Development of the Tanakura strike-slip basin in Japan during the opening of the Sea of Japan: Constraints from zircon U–Pb and fission-track ages

A new legume fruit species from the mid-Miocene Climatic Optimum in Japan

茨城県大子町に露出する中新統内大野層の石灰質ナノ化石年代

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