3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Grandidiericeras nagaoi | |
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| Author | Matsumoto and Saito, 1987 | |
| Reference | Trans. Proc. Palaeont. Soc. Japan, N. S., No. 145, p. 2, figs. 1A - C & 3 - 1a, b, c | |
| Type specimen | Holotype: GMH. No. 12008 | |
| Type locality | Loc. IK 966d, a river - side outcrop in the Ikushumbets River, now submerged under the Katsurazawa Lake, Mikasa City, Sorachi Province, central Hokkaido (142^00'40" E, 43^14'11" N) | |
| Formation name | Green sandstone (Member GS2), Upper Yezo Group | |
| Age | Coniacian, Upper Cretaceous | |
| Remarks | ||