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Josho Lake Deposit Iijima, 1969

Invalid synonym: Shioda Formation

• Coherent formation
• Lake Josho fill deposit, which was formed twice.
• Pleistocene (? - 25 ka yBP, ¹⁴C)

• Sedimentary facies: Lacustrine
• Lithofacies: Sandstone, Mudstone, Conglomerate
• Lithofacies (Minor): Lignite

• Upper limit: Conformity (Loam)
• Lower limit: Unconformity (Aoki Formation, Uchimura Formation, Bessho Formation, Iseyama Formation, Nunobiki Formation)

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

• Distribution: Shiotadaira - Chikuma river - Sangawa river - Yugawa river - Urano river, Ueda city, Nagano pref.; Tobu town, Tomi city, Nagano pref.; Aoki city, Chiisagata county, Nagano pref.
• Fossils (Mammalia): Cervus nippon yesoensis, Cervus yagianus, Equus hemionus, Palaeoloxodon namadicus naumanii, Sinomegaceros (Sinomegaceroides) yabei

• Kato (1980) Geology of the Sakaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)
• Iijima et al. (1969) Jour. Geol. Soc. Japan, vol.23, no.2, pp.63-72 DOI