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(Invalid name) Shigarami Formation (Honma, 1931) Kato et al., 1989

Redefined by dividing into Gonda Formation, Takafu Formation, Arakurayama Formation, Ogikubo Formation in ascending order.

• Type locality: Susobana river, Konabe - Doai, Nagno city, Nagano prefecture
• Type locality: Dojiri river, Sasadaira - Nakajo, Nagano city, Nagano prefecture
• Coherent formation
• late Miocene - Pliocene

• Sedimentary facies: Marine
• Lithofacies: Sandstone, Mudstone, Conglomerate
• Lithofacies (Minor): Acidic tuff, Andesite pyroclastic rocks

• Thickness: 1,200 m or thicker
• Upper limit: Lithofacies boundary
• Upper limit: Conformity, partly Unconformity (Sarumaru Formation)
• Lower limit: Lithofacies boundary
• Lower limit: Conformity (Ogawa Formation)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Susobana river, Konabe - Doai, Nagno city, Nagano pref.; Dojiri river, Sasadaira - Nakajo, Nagano city, Nagano pref.; Saikawa river, Nagano city, Nagano pref.

• Tanabe (2015) Jour. Geol. Soc. Japan, vol.121, no.8, pp.265-278, DOI
• Kato et al. (1989) Geology of the Omachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 111p. (in Japanese with English abstract 7p.)
• Kato and Akahane (1986) Geology of the Nagano District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 120p. (in Japanese with English abstract 5p.)