The Ryugase Group is a geological formation on

Sakhalin Island Sakhalin ( rus, Сахали́н, p=səxɐˈlʲin) is an island in Northeast Asia. Its north coast lies off the southeastern coast of Khabarovsk Krai in Russia, while its southern tip lies north of the Japanese island of Hokkaido. An islan ...

in far eastern Russia whose strata date back to the

Late Cretaceous The Late Cretaceous (100.5–66 Ma) is the more recent of two epochs into which the Cretaceous Period is divided in the geologic time scale. Rock strata from this epoch form the Upper Cretaceous Series. The Cretaceous is named after ''cre ...

.Kawakami Colliery, Sakhalin
at

Fossilworks Fossilworks was a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database, a large relational database assembled by hundreds of paleontologists from around the world. History Fossilworks was cr ...

.org

Vertebrate paleofauna

* '' Nipponosaurus sachalinensis'' - "Partial skull and associated postcrania, juvenile.""Table 20.1," in Weishampel, et al. (2004). Page 442. Probably actually from the Yezo Group.

References

Bibliography

* Geologic groups of Asia Geologic formations of Russia Upper Cretaceous Series of Asia Cretaceous Russia Campanian Stage Santonian Stage Mudstone groups Shallow marine deposits Paleontology in Russia Geography of Sakhalin Oblast {{SakhalinOblast-geo-stub

Vertebrate paleofauna

See also

References

Bibliography