3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Olcostephanus unicus | |
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| Author | Yabe, 1904 | |
| Reference | Jour. Coll. Sci., Imp. Univ. Tokyo, Vol. 20, No. 2, p. 28, pl. 6, fig. 5 | |
| Type specimen | Holotype: UMUT MM7457 (= GT. I - 255) | |
| Type locality | Kamitakambe Creek, a right branch of the Ikushumbets River, between the Poronai and the Ikushumbets coal mines, Province of Sorachi, central Hokkaido (141^57'22" E, 43^14'06" N) | |
| Formation name | Mikasa Formation, Middle Yezo Group | |
| Age | Cenomanian, Upper Cretaceous | |
| Remarks | (= Eogunnarites unicus (Yabe, 1904)) / Remarks. The generic position of this species was transferred to Eogunnarites by Wright and Matsumoto (1954, p. 126). / Reference: Wright, C. W. and Matsumoto, T., 1954. Mem. Fac. Sci., Kyushu Univ., Ser. D, Vol. 4, No. 2, pp. 107 - 134, pls. 7 - 8. | |