Molluscan fossils were collected from the lower Miocene Akeyo Formation (18 Ma) of the Mizunami Group at the outcrop exposed during the construction of Togari-Tsukiyoshi City Road in Akeyo-cho, Mizunami City. Minor
Minolia tukiyosiensis (Oyama and Saka), “
Pseudomurex?”
tukiyosiensis Oyama and Saka, and
Hiatula minoensis (Yokoyama) occur in a lenticular shell bed
dominated by
Crassostera sp. in the middle part of the Togari Member, Akeyo Formation. The oyster
shells seem to have been transported and accumulated into the final depositional site from a small
oyster reef within estuary environment by tidal or storm currents.
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