Ashizawa Formation

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]

Ashizawa Formation
Stratigraphic range: Coniacian PreꞒ Ꞓ O S D C P T J K Pg N ↓
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

Palaeofauna

• Dinosauria indet.
• Squalus sp.
• Theria indet.
• Theropoda indet. ("Futabasaurus") - "tibia"^[3]

See also

• Earth sciences portal
• Paleontology portal
• Dinosaurs portal

• List of dinosaur-bearing rock formations
  • List of stratigraphic units with indeterminate dinosaur fossils