Abstract
Tokyo. Some vertebrate fossils, Cetacea, Cervidae, and Proboscidea (Stegodon sp.) have been found in this area.
The fossil described in this paper was a left metacarpal. This is the fourth report of cervid fossils from
Hirayama Formation, and the first report of postcranial bone. The bone was almost intact and subjected to little weathering. The bone had the “Cannon bone” shape, and was medium in size. The proximal epiphysis was triangular in shape with facets meeting posteriorly. The fossil was largert han recent subgenus Sika, and almost same as or larger than extinct subgenus Nipponicervus. Recent genus Elaphurus and extinct subgenus Axis in Japan were larger than the fossil. These characteristics and the size of the bone suggested this fossil belongs to Cervus sp. However, there were no features which alowed it to be further identified into cervid subgenus and species.
