8Fossil sites
Mutsuo Formation
Mutsuo Formation in Japan: 8 fossil sites. Typical age: 72–66 million years (Cretaceous).
8Fossil sites
5Finds
72–66 million yearsTypical age
CretaceousMain period
Where its fossils were found
Cretaceous
By geological period
Cretaceous8
What was found
Mosasaurs · 5Mosasaurus, Kourisodon
Towns with the most fossil sites nearby
Other formations of the same period
Cretaceous
Hinoshima Formation 79Saku Formation 55Hiraiga Formation 46Tanohata Formation 30Enokuchi Formation 29Chinomigawa Formation 27Hikagenosawa Formation 20Urakawa Formation 20Seidan Formation 19Upper Haborogawa Formation 19Haborogawa Formation 19Hakobuchi Formation 19Ashizawa Formation 17Kashima Formation 16Itsuki Formation 15Ishido Formation 14Birafu Formation 12Todai Formation 11Mikasa Formation 11Nagase Formation 11Kitadani Formation 10Mikasa Sandstone 9Sebayashi Formation 8Kuwajima Formation 8