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Koguchi Formation
- Coherent formation
- Miocene
- Sedimentary facies: Marine
- Lithofacies (Upper): Interbedded sandstone and mudstone
- Lithofacies (Lower): Siltstone
- Lithofacies (Lower, Minor): Sandy siltstone
- Lithofacies (Basal): Conglomerate
- Lithofacies (Basal, Minor): Sandstone
- Thickness (Upper): 0 - 500 m
- Thickness (Lower): 350 - 1,000 m
- Thickness (Basal): 30 - 250 m
- Upper limit: Transitional (Mitsuno Formation)
- Lower limit: Unconformity (Uchikoshi Formation)
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Oroshi, Ohama town, Minamimuro county, Mie pref.; Oyatani - Sugitani, Kozagawa city, Higashimuro county, Wakayama pref.; Ukegawa - Otsuga, Tanabe city, Wakayama pref.; Koguchi - Kitanokawa - Kuju, Kumanogawa town, Shingu city, Wakayama pref.; Kashiwara - Ogawa, Nachikatsuura city, Higashimuro county, Wakayama pref.
- Fossils (Shellfishes): Anadara nakamurai, Lucinoma acutilineata, Lucinoma cf. izirii, Macoma optiva, Portlandia murayamai, Solemya tokunagai, Thyasira bisecta, Trapezium cf. japonicum, Turritella s-hataii, Turritella tanaguraensis, Yoldia sp.
- Kawakami and Hoshi (2007) Jour. Geol. Soc. Japan, vol.113, no.7, pp.296-309 DOI
- Suzuki et al (1979) Geology of the Kurisugawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 5p.)
- Murayama (1954) Shingu, Atawa, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 27p. (in Japanese with English abstract 6p.)