The Akaiwa Formation () is an Early Cretaceous (Hauterivian-Barremian) geologic formation in central Honshu, Japan. Indeterminate ornithischian fossils are known from the formation. Fossil ornithopod tracks have been reported from the formation. As well as the turtle Kappachelys
Fossil content
The following fossils have been reported from the formation: Osteichthyes indet. - 'fish scales' Reptiles Turtles Kappachelys okurai Crocodylomorpha indet. - isolated teeth of small crocodiles ?Euornithopoda indet. Neochoristodera indet. - a nearly complete right premaxilla Ornithopoda indet. - isolated teeth of small ornithopods ?Theropoda indet.