3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Sornayceras proteus | |
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| Author | Matsumoto, 1965 | |
| Reference | Mem. Fac. Sci., Kyushu Univ., Ser. D (Geol.), Vol. 16, No. 3, p. 227, pl. 40 [23], fig. 1; text - figs. 11 [51] - 12 [52] | |
| Type specimen | Holotype: GK. H5438 | |
| Type locality | Yoshiyachi - zawa Creek, a branch of the Ikushumbets River, Mikasa City, Sorachi province, central Hokkaido | |
| Formation name | Upper Yezo Group | |
| Age | Upper Lower Urakawan (= Upper Coniacian), Upper Cretaceous | |
| Remarks | ||