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Kongochi Formation (Mitsuchi, 1933) Tokuhashi and Endo, 1984
- Type locality: Kongochi, Ichihara city, Chiba prefecture
- Coherent formation
- Fore-arc basin sediments (Kazusa trough)
- Pleistocene
- Contemporaneous heterotopic facies: upper Kasamori Formation
- Sedimentary facies: Shallow marine
- Sedimentary facies: Storm-dominated seashore - Shoreface
- Water temperature: Cold ocean current (Shellfishes)
- Lithofacies (Upper): Sands
- Lithofacies (Upper, Minor): Gravels
- Lithofacies (Lower): Sands
- Sedimentary structures (Upper): Trough cross-stratification, Low-angle planar cross-stratification, Parallel stratification, Convolute foliation
- Sedimentary structures (Lower): Wedge-shaped cross-stratification, , Hummocky cross-stratification, Parallel stratification, Convolute foliation, Pipe rocks
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kongochi, Ichihara city, Chiba pref.
- Fossils (Shellfishes): Acila divaricata, Batillaria multiformis, Callithaca adamsi, Glycymeris yessoensis, Macoma incongrua, Mercenaria stimpsoni, Patinopecten tokyoensis, Raeta yokohamensis, Spisula sachalinensis, Tapes japonicus, Umbonium costatum, Venericardia ferruginea
- Fossils (Pollen): Abies sp., Larix sp., Menyanthes sp., Picea sp., Tsuga sp.
- Fossils (Trace fossils): Macaronichnus segregatis, Rosselia socialis
- Tephra: Ks5, Ks6
- GSSP proposal group (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.5-22 DOI
- Nanayama et al. (2016) Geology of the Mobara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
- Tokuhashi and Endo (1984) Geology of the Anesaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 6p.)