3D digital model database TYPE SPECIMENS of Cretaceous ammonoid in Japan
| Scientific name | Pachydiscus subcompressus obsoletus | |
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| Author | Matsumoto, 1954 | |
| Reference | In T. Matsumoto (editor): The Cretaceous System in the Japanese Islands, Jap. Soc. Prom. Sci., Tokyo, p. 289, pl. 10, fig. 5a, b | |
| Type specimen | Holotype: UMUT MM6830 (= GT. I - 2827)( pl. 10, fig. 5a, b); Paratype: UMUT MM6831(= GT. I - 2828) | |
| Type locality | Hayakawa, the Naibuchi Valley, Naibuchi (=Naiba) district, south Sakhalin, Russia | |
| Formation name | Ryugase Group ? | |
| Age | Maastrichtian, Upper Cretaceous | |
| Remarks | ||