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Komiya Formation (Hatori and Juen, 1958) Ueki, 2007
- Type locality: Tamagawa river, Haijima town, Akishima city, Tokyo
- Coherent formation
- early Pleistocene
- Correlation: Hirayama Formation
- Sedimentary facies: Marine
- Sedimentary facies: A cycle of regression - transgression sequence
- Lithofacies (Upper): Interbedded sands and gravels
- Lithofacies (Middle): Silt, Sands
- Lithofacies (Lower): Gravels
- Sedimentary structures (Middle): Pipe rocks, Trough cross-stratification, Hummocky cross-stratificaiton, Swaley cross-stratification
- Sedimentary structures (Lower): Channel structure
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Haijima town, Akishima city, Tokyo; Miyashita town - Ishikawa town - Kasumi town - Utsuki town - Yachigawa river, Hachioji city, Tokyo
- Fossils: Shellfishes, Barnacles
- Fossils: Cervus sp., Elaphurus akashiensis (<= Cervus akashiensis), Elaphurus tamaensis, Japonocetus akishimensis, Stegodon aurorae
- Fossils (Plants): Cunninghamia cfr. lanceolata, Metasequoia sp., Picea maximowiczii
- Fossils: Pipe rocks
- Tephra: Kol
- Ueki et al. (2013) Geology of the Hachioji District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 137p. (in Japanese with English abstract 6p.)
- Ueki and Sakai (2007) Geology of the Ome District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 189p. (in Japanese with English abstract 5p.)