抄録
The Pliocene Tsubusagawa Formation is distributed in Ajimu Basin, Oita Prefecture, Japan. To collect small vertebrate fossils of the Tsubusagawa Formation, sedimentary rocks in mesh sacks were first left unaltered on the riverbank. Over the winter, the rocks weathered by freeze-thawing. The weathered rocks were then washed through gardening sieves and window screen nets. This resulted in a large collection of small vertebrate fossils, such as cyprinid pharyngeal teeth.
