Ryugase Group

The Ryugase Group is a geological formation on Sakhalin Island in far eastern Russia whose strata date back to the Late Cretaceous.^[1]

Ryugase Group
Stratigraphic range: Late Santonian- Early Campanian ~85–72 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Overlies	Yezo Group
Lithology
Primary	Mudstone
Location
Coordinates	47.2°N 142.5°E / 47.2; 142.5
Approximate paleocoordinates	51.9°N 130.0°E / 51.9; 130.0
Region	Sakhalin Oblast
Country	Russia
Extent	Sakhalin Island
Ryugase Group (Russia)

Vertebrate paleofauna

• Nipponosaurus sachalinensis - "Partial skull and associated postcrania, juvenile."^[2] Probably actually from the Yezo Group.

See also

• List of dinosaur-bearing rock formations
• List of fossiliferous stratigraphic units in Russia