3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Marshallites olcostephanoides | |
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| Author | Matsumoto, 1955 | |
| Reference | Jap. Jour. Geol. Geogr., Vol. 26, Nos. 1 - 2, p. 129, pl. 8, fig. 5a, b | |
| Type specimen | Holotype : GK. H1552 | |
| Type locality | Loc. Y140d, Hikage - no - sawa Creek, a tributary of the Yubari River, Oyubari area, Sorachi Province, central Hokkaido (142^09'58" E, 43^09'23" N) | |
| Formation name | Member IIm, Middle Yezo Group | |
| Age | Cenomanian, Upper Cretaceous | |
| Remarks | ||