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Osaka Group

• Type locality: Senri hills, Osaka prefecture
• Coherent formation
• Pliocene - Pleistocene
• Correlation (Upper): Shinocho Formation, Koshihata Formation
• Correlation: Katata Formation, Ueno Formation

• Sedimentary facies: Fluvial, Lacustrine
• Sedimentary facies (Upper, Minor): Marine
• Lithofacies: Sands, Gravels
• Lithofacies (Minor): Clay

• Thickness: 200 - 2,000 m or thicker
• Upper limit: Unconformity (Higher I Terrace Deposits, Middle Terrace Deposits, Narazaka Gravel Bed, Lower Terrace Deposits)
• Lower limit: Unconformity (Izumi Group, Arima Group, Kobe Group, Nose Pluton, Katano Granite, Taike Granite, Mikasa Andesite)

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

• Distribution: Keihanna - Osaka - Akashi - Himeji
• Distribution: Senri hills, Osaka pref.; Misaki park, Misaki city, Sennan county, Osaka pref.; Mount Shimakumayama, Toyonaka city, Osaka pref.; Nara city, Nara pref.; Monryugawa river, Kurodasho town, Nishiwaki city, Hyogo pref.; Inagawa town, Kawabe county, Hyogo pref.; Kawanishi city, Hyogo pref.; Ikeda city, Hyogo pref.; Minoo city, Hyogo pref.; Egeyama town - Yumeno town - Nishidai - Sumiyoshigawa river, Kobe city, Hyogo pref.
• Fossils (Plants): Abies sp., Canninghamia konishii, Chamaecyparis sp., Magnolia kobus, Metasequoia disticha, Picea koribai, Pinus parviflora, Pseudotsuga cf. subrotunda, Pterocarya paliurus, Sciadopithys verticillata, Styrax cf. microcarpa, Thuja sp., Tsuga sp.

• Wakita et al. (2013) Geology of the Kyoto-Tonambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 124p. (in Japanese with English abstract 3p.)
• Miyata et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.37-52 DOI
• Hongo (2009) Jour. Geol. Soc. Japan, vol.115, no.2, pp.64-79 DOI
• Miyachi et al. (2005) Geology of the Kyoto-Seinambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 90p. (in Japanese with English abstract 4p.)
• Miyachi et al. (2001) Geology of the Osaka-Tohokubu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 130p. (in Japanese with English abstract 6p.)
• Ozaki et al. (2000) Geology of the Nara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 162p. (in Japanese with English abstract 5p.)
• Matsuura et al. (1995) Geology of the Hirone District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 110p. (in Japanese with English abstract 6p.)
• Kurimoto et al. (1993) Geology of the Sasayama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)
• Ozaki and Matsuura (1988) Geology of the Sanda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)
• Huzita and Kasama (1983) Geology of the Kobe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 115p. (in Japanese with English abstract 8p.)
• Huzita and Kasama (1982) Geology of the Osaka-Seihokubu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 8p.)