Bulletin of the Mizunami Fossil Museum No. 47
Strontium isotope analysis of Crenomytilus grayanus (Bivalvia: Mytilidae) from the Lower Miocene Akeyo Formation of the Mizunami Group, Japan
- BMFM47-008Andoetal（PDF 5.96MB）
- BMFM47-008Andoetal-s（PDF 2.37MB）
Ando et al. (2020) print-version
Ando et al. (2020) small-version
Published: 2020/11/28 Page: 89–93
The strontium isotope ratio (87Sr/86Sr) of the shell of Crenomytilus grayanus (Dunker) from the Yamanouchi Member of the Akeyo Formation, Mizunami Group in Toki-cho, Mizunami City, Gifu Prefecture, Japan is determined. The strontium age suggests that the Crenomytilus grayanus-bearing horizon has been deposited at 17.8 ± 0.3 Ma. Therefore, the occurrence of C. grayanus in central Japan may have been related to the Early Miocene global cooling event (Mi1b) at 17.8 Ma.