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Uchikoshi Formation
Invalid synonym: Yomurakawamuro Formation
- Type locality: Hikigawa river, Uchikoshi - Hirase, Tanabe city, Wakayama prefecture
- Accretionary complex
- middle - late Eocene
- Intruded by: Sandstone dikes
- Sedimentary facies: Marine
- Lithofacies (Top): Conglomerate
- Lithofacies: Sandstone, Sandstone-dominant interbedded sandstone and mudstone
- Lithofacies (Minor): Mudstone, Mudstone-dominant interbedded sandstone and mudstone
- Sedimentary structures: Cross stratification, Current marks, Wave ripples, Flute marks, Groove marks
- Paleocurrent (Longitudinal current flow): from East-northeast to West-southwest
- Paleocurrent (Lateral current flow): from North, from South
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Hikigawa river - Uchikoshi - Hirase - Gogawa - Fukatani - Kawaradani - Mount Hansamine - Mount Hyakkenzan - Uigo - Mount Nohoshiyama - Kurozodani valley - Mount Kashiwayama - Mount Omoriyama, Tanabe city, Wakayama pref.; Otogawa river - Narui - Tamanotani valley - Tochinotani valley - Hiraigawa river - Shogungawa river - Mount Dishiyama - Mount Shogunyama, Kozagawa city, Higashimuro county, Wakayama pref.; Okuyamadani valley - Obaradani valley, Kumanogawa town, Shingu city, Wakayama pref.; Miyagidani? valley - Numatadani valley - Makiodani valley - Otsuke - Kotsuke - Shirokawa river - Hiraodani valley, Susami city, Nishimuro county, Wakayama pref.; Tamade, Shirahama city, Nishimuro county, Wakayama pref.
- Fossils (Shellfishes): Acila (Truncacila) sp., Callista sp., Lucinoma sp., Turritella sp.
- Fossils: Trace fossils
- Tokuoka et al (1981) Geology of the Ryujin District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 6p.)
- Tateishi et al. (1979) Geology of the Esumi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 65p. (in Japanese with English abstract 6p.)
- 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.)
- Mizuno and Imai (1964) Tanami, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 61p. (in Japanese with English abstract 4p.)