The Early Pleistocene Omma Formation was distributed around Kanazawa City, Ishikawa Prefecture. The Omma Formation was composed of mainly fine to medium- grained sandstone. The formation yield over 250 species molluscs (Matsuura, 1996a) and vertebrates of 36 samples including cetaceans were recorded (Matsuura, 1996b). In addition to those, new cetacean fossils of 9 specimens were known since 1996 from the distribution area of the Omma Formation in Kanazawa. And an only specimen of those was found from the Middle Miocene Saikawa Formation. The total cetacean fossils were 24 specimens from the area, and they were as follows : cetacean vertebrae and premaxilla, mysticetian (including families of Balaeopteridae, Eschrichtiidae and Cetotheriidae) mandibles, skull, vertebrae and radius, and odontocetian (including families Delphinidae and Globicephalidae) vertebrae, humerus and tooth.
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