Bulletin of the Mizunami Fossil Museum No. 49
Additional information of Strontium isotope ratios of molluscs from the Miocene Akeyo Formation of the Mizunami Group, Japan
- 49-011Andoetal_print（PDF 0.39MB）
Ando et al. (2022a) print-version
Published: 2022/10/7 Page: 119–122
Additional strontium isotope ratio (87Sr/86Sr) of molluscs including Crenomytilus grayanus (Dunker), from the Akeyo Formation of the Mizunami Group in Mizunami City, Gifu Prefecture, central Japan are determined. The strontium isotopic ages suggest that the Crenomytilus grayanus-bearing horizon (most-lower part of the Yamanouchi Member, Akeyo Formation) has been deposited at ca. 17.8 Ma. In addition, upper part of the Kubohara Facies (middle part of the Maki Member), Iwamura Group has been deposited at same age of the Yamanouchi Member.