Discovery of cetacean fossil from Osarushinai Formation (Lower Pleistocene), Tokachi, Hokkaido - 1973
The skeleton of Desmostylus mirabilis from South Sakhalin I. Atlas and thoracic vertebrae - 1980
Occurrences of early-middle Pleistocene mammalian fossils from the Nopporo Hills in the Ishikari Lowland, Hokkaido - 1983
On two fossil humeri of Otarioidea from the Shiotsubo Formation (Late Miocene) of Fukushima Prefecture, Northeast Japan - 1985
Three fossil marine mammals from the Neogene of Sakiyama Peninsula, Ishakawa Prefecture, Central Japan - 1986
Fossil of Otarioidea from the Tatsunokuchi Formation (lower Pliocene) of Sendai City, Miyagi Prefecture - 1987
On a fossil of Otariidae (Mammalia) from the middle Pleistocene Mandano Formation of Ichihara City, Chibu Prefecture, Japan - 1987
A fossil cetacean skull (Berardius sp. indet.) from Dogama, Ogi-machi, Sado Island, Central Japan - 1989
Occurrence of Early Pliocene otariid fossil in Numata-cho, Hokkaido - 1990
Odontocete fossils from the Miocene Morozaki Group, Chita Peninsula, Aichi Prefecture, Central Japan - 1993
Odobenus rosmarus from Lower Pleistocene in the Nopporo Hills, Hokkaido, Japan - 1993
Sirenian fossils (Hydrodamalis) from early Pliocene of Hombetsu and early Pleistocene of Kuromatsunai, Hokkaido - 1995
Halitheriine sirenia from the Itahana Formation (late Middel Miocene - early late Miocene) in Annaka, Gunma Prefecture, central Japan - 2002
A fossil balaenopterid whale from the Upper Miocene Shiotsubo Formation in Takasato, Kitakata City, Fukushima Prefecture, northeast Japan - 2010