Kuwajima Formation

Kuwajima Formation
Stratigraphic range:
Unit ofTetori Group
Sub-unitsLower Member, Upper Member
UnderliesAkaiwa Formation
OverliesGomijima Formation
Lithology
PrimarySandstone, Mudstone
Location
CountryJapan

The Kuwajima Formation is an Early Cretaceous geologic formation in Japan. Its precise age is uncertain due to a lack of identifying fossils, and it was previously considered likely Valanginian to Hauterivian in age. However, it is now considered to probably be Barremian in age. Dinosaurs and other vertebrates has been recovered from the Kaseki-kabe "Fossil-bluff" locality in the uppermost part of the formation.

The multituberculate mammals Hakusanobaatar matsuoi and Tedoribaatar reini are known from the Kuwajima Formation. A member of Tritylodontidae, Montirictus kuwajimaensis, has also been recovered from the unit.

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