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Ichinose Sandstone and Conglomerate Member Kosaka and Yamagishi, 1988

Invalid synonym: Ichinose Sandstone and Conglomerate Facies, Ichinose Formation, Hongo Formation

• Type locality: Metobagawa river - Funegasawa creek - Ichinose - Shinajozawa creek, Matsumoto city, Nagano prefecture
• Coherent formation
• middle Miocene
• Contemporaneous heterotopic facies: Reisenji Volcanics Member

• Sedimentary facies (Minor): Debris flow deposit
• Depth of water: Middle bathyal (Foraminifera)
• Lithofacies (Upper): Sandstone
• Lithofacies (Middle): Conglomerate
• Lithofacies (Middle, Minor): Gravel-bearing mudstone
• Lithofacies (Lower): Conglomerate
• Lithofacies (Minor): Rhyolite - Dacite tuff
• Sedimentary structures (Upper): Trough cross-stratification
• Sedimentary structures (Middle, Minor): Graded bedding
• Sedimentary structures (Lower): Imbricate structure, Reversed graded bedding
• Paleocurrent: from East to west, from Southwest to Northeast

• Thickness: ca. 400 m
• Thickness (Upper): 0.8 - 1 m
• Thickness (Middle): 1 - 5 m
• Thickness (Lower): 0.2 - 0.5 m
• Upper limit: Conformity (Hosoonotaki Volcanics Member, Kariyahara Sandstone and Mudstone Member)
• Lower limit: Conformity (Asamatoge Sandstone and Mudstone Member)

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

• Distribution: Metobagawa river - Funegasawa creek - Ichinose - Shinajozawa creek - Mount Ibukajoyama - Inaguratoge pass - Misayamatoge pass, Matsumoto city, Nagano pref.; Uchimuragawa river - Oshio, Ueda city, Nagano pref.
• Fossils: Pipe rocks

• Kosaka et al. (2022) Earth Science (Chikyu Kagaku), vol.76, no.4, pp.179-194 DOI
• Harayama et al. (2009) Geology of the Matsumoto District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 3p.)