3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Yokoyamaoceras ornatum | |
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| Author | Matsumoto, 1956 | |
| Reference | Jap. Jour. Geol. Geogr., Vol. 27, p. 183, pl. 16, fig. 3a, b | |
| Type specimen | Holotype: GK. H5210 | |
| Type locality | The Abeshinai River, Saku - Abeshinai area, Nakagawa Town, Teshio Province, northern Hokkaido | |
| Formation name | Upper Yezo Group | |
| Age | Senonian, Upper Cretaceous | |
| Remarks | ||