<国立科博専報>佐渡島の第三紀脊椎動物化石

概要

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Information on the Tertiary vertebrate fossils from Sado Island, Niigata Prefecture, Japan, is compiled from the data of our field survey. The Tsurushi Formation (Late Middle Miocene) yields the most of vertebrate materials, and the Nakayama-toge rising on the border of the Sawada-machi and Aikawa-machi is the locality for the greatest amount and variety. The clupeid fishes and marine mammals (Odontoceti, Mysticeti, pinnipedia, etc.) are common in the Tsurushi Formation. There also yields from this horizon, Charcarodon megalodon and Isurus desori as shark teeth, some teleost fishes and a bird fossil. From other horizons, there have been discovered a freshwater fish of the Cyprinidae, gen. et sp. indet. from the Masaragawa Formation of Seki, Aikawa-machi, and the unique Tertiary marine mammal, Paleoparadoxia tabatai from the Orito Formation (the Nishikurosawa Stage) of the Nakayama-toge. The bird fossil from the Tsurushi Formation of the Nakayama-toge at Sado Island is a Miocene pigeon, of the family Columbidae (Order Columbiformes). This fossil skeleton from the Tsurushi Formation is well preserved, and shows the characteristic skull and hind limb bones. Therefore it suggests that this fossil pigeon is a very important specimen for the future phylogenetic analysis of pigeons and doves (Columbidae).
国立科学博物館の論文
1985-12-01