The Akaiwa Formation () is an Early Cretaceous (Aptian) geologic formation in central Honshu, Japan. Fossils of the turtle Kappachelys and indeterminate ornithischians are known from the formation, as well as fossil ornithopod tracks.Hirayama et al., 2013Weishampel et al., 2004, pp.517-607
Fossil content The following fossils have been reported from the formation:Akaiwa Formation in the Paleobiology Database Osteichthyes indet. - 'fish scales' Reptiles Turtles Kappachelys okurai Crocodylomorpha indet. - isolated teeth of small crocodilesMatsukawa & Obata, 1994 ?Euornithopoda indet. Neochoristodera indet. - a nearly complete right premaxillaMatsumoto et al., 2014 Ornithopoda indet. - isolated teeth of small ornithopods ?Theropoda indet.
Ichnofossils Ornithischia indet. - tracksAzuma & Tomida, 1995
See also List of dinosaur-bearing rock formations List of stratigraphic units with indeterminate dinosaur fossils List of stratigraphic units with ornithischian tracks Ornithopod tracks
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