3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Yokoyamaoceras (?) mysticum | |
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| Author | Matsumoto, 1955 | |
| Reference | Jap. Jour. Geol. Geogr., Vol. 26, Nos. 1 - 2, p. 155, pl. 10, fig. 1a, b | |
| Type specimen | Holotype: GK. H3379 | |
| Type locality | Loc. U147p, Urakawa area, Hidaka Province, southern central Hokkaido (142^49'43" E, 44^10'44" N) | |
| Formation name | Upper Yezo Group | |
| Age | Senonian, Upper Cretaceous | |
| Remarks | ||