At the 6 th. Ordinary Meeting of the Palaeontological Society of Japan (1937), the occurrence of Neogene mollusks from the Toinioka-Simonita district, Gummaken was reported by Mr. K. SUZUKI. In 1938, Dr. HUZIMOTO and Mr. KOBAYASI described the geology of the district, and according to them the geological sequence of the Neogene deposits is as follows (in descending order).
