Ashizawa Formation | |
Type: | Geological formation |
Period: | Coniacian |
Region: | northern Honshu |
Country: | Japan |
Unitof: | Futaba Group |
Subunits: | Asamigawa Member, Obisagawa Member |
Underlies: | Kasamatsu Formation |
Overlies: | Early Cretaceous Granite, Permian shale and sandstone |
The Ashizawa Formation is a Coniacian geologic formation in northeastern Honshu, Japan. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.[1] A jawbone belonging to a therian mammal has also been discovered from this unit.[2]