Ashizawa Formation | |
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Stratigraphic range: | |
Type | Geological formation |
Unit of | Futaba Group |
Sub-units | Asamigawa Member, Obisagawa Member |
Underlies | Kasamatsu Formation |
Overlies | Early Cretaceous Granite, Permian shale and sandstone |
Location | |
Region | northern Honshu |
Country | Japan |
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]