Bulletin of the Mizunami Fossil Museum No. 47
Outcrop of the Miocene Mizunami Group at the construction site of the Togari-Tsukiyoshi City Road in Akeyo-cho, Mizunami City, Japan
- BMFM47-012Ando&Hoshi（PDF 10.39MB）
- BMFM47-012Ando&Hoshi-s（PDF 3.51MB）
Ando & Hoshi (2020) print-version
Ando & Hoshi (2020) small-version
Published: 2020/12/20 Page: 111–123
The Lower Miocene Togari and Yamanouchi members (ca 18 Ma) of the Akeyo Formation, Mizunami Group, were exposed at the construction site of the Togari-Tsukiyoshi Road in Akeyo-cho, Mizunami City, central Japan. Their lithologies are described. The Togari Member, 25 m thick, overlies the Toki Granite and consists mainly of tuffaceous sandstone with three tuff layers including Tu-tuff. The middle part of the member contains lenticular shell lens of Crassostrea. The lower part of the Yamanouchi Member consists mainly of tuffaceous silty sandstone. Pinniped fossils occur in the lowermost part of the member (20 cm above the boundary between Togari and Yamanouchi members). Measurements of the anisotropy of magnetic susceptibility (AMS) suggest that a paleocurrent direction was NE–SW or NW–SE with an unknown upstream direction for the stratigraphic horizon just above the Togari/Yamanouchi boundary.