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Gongenyama Unit (Katsurada, 1956) Ueki et al., 2013

Invalid synonym: Gongenyama Formation

• Type locality: Mount Gongen, Uenohara city, Yamanashi prefecture
• Accretionary complex
• Deposition: early Paleogene - middle Eocene (Radiolarians)

• Sedimentary facies: Marine
• Lithofacies: Coherent facies
• Lithofacies: Conglomerate, Sandstone, Interbedded sandstone and shale
• Lithofacies (Minor): Shale

• Thickness: ca. 1,500 - 2,100 m or thicker
• Upper limit: Thrust fault
• Lower limit: Thrust fault

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

• Distribution: Mount Gongen - Tsurukawa river, Uenohara city, Yamanashi pref.; Kuzunogawa river, Otsuki city, Yamanashi pref.; Kusaki - Takenomukai, Nanaho town, Otsuki city, Yamanashi pref.; Fujiki river - Hino, Fujino village, Sagamihara city, Kanagawa pref.
• Fossils (Radiolarians): Amphicraspedum sp., Amphisphaera aotea, Amphisphaera coronata, Bathropyramis sp., Clathrocyclas hyronia, Calocyclas hyronta, Cornutella sp., Lithelius minor, Lithomespilus coronatus, Podocyrtis platypus, Protoxiphotractus sp.
• Fossils (Diatoms): Arachnoidiscus sp.

• 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.)
• Saruta and Takahashi (2012) Jour. Geol. Soc. Japan, vol.118, no.1, pp.53-58 DOI
• Sakai (1987) Geology of the Itsukaichi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 75p. (in Japanese with English abstract 5p.)