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Nodono Formation (Fujimoto and Kobayashi, 1938) Nakamura and Takasaki Geological Circle, 1989

• Type locality: Nodono, Annaka city, Gunma prefecture
• Volcanic rocks
• middle Pleistocene (430 ka, FT)

• Sedimentary facies: Mudflow deposit
• Lithofacies (Upper): Tuff breccia
• Lithofacies (Middle): Tuffaceous silt
• Lithofacies (Lower): Tuff breccia
• Lithofacies (Bottom): Tuffaceous silt

• Thickness: 10 - 60 m
• Thickness (Upper): 20 m
• Thickness (Middle): 5 - 6 m
• Thickness (Lower): 30 m
• Thickness (Bottom): 5 - 6 m
• Lower limit: Angular unconformity (Itahana Formation)

• Distribution: Nodono - Iwanoya hills - Itahana, Annaka city, Gunma pref.
• Fossils: Insects, Freshwater diatoms

• Geshi and Takeuchi (2012) Geology of the Haruna San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)