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Kitaaiki Formation

• Coherent formation
• Oligocene
• Intruded by: Rhyolite dyke

• Lithofacies: Conglomerate, Sandstone, Shale
• Lithofacies (Minor): Tuff

• Thickness: 150 m or thicker

• Distribution: Yamaguchi - Hakose - Kawamata, Kitaaiki city, Minamisaku county, Nagano pref.
• Fossils (Plants): Alnus sp., Juglans sp., Platanus sp., Salvinia sp.
• Fossils (Shellfishes): Macoma sp., Ostrea sp., Phacoides sp., Turritella sp.

• Kawachi (1974) Geology of the Tateshinayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 5p.)