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Shimosa Group (Kawai, 1961) Tokuhashi and Endo, 1984

Invalid synonym: Narita Group

• Coherent formation
• Paleo-Tokyo bay fill deposit
• A group of formations defined as a deposition cycle by a series of sea-level changes (Terrestrial to Marine)
• middle - late Pleistocene

• Sedimentary facies: Shallow marine
• Sedimentary facies (Top): Seashore
• Sedimentary facies (Upper): Shallow marine
• Sedimentary facies (Middle): Inner bay
• Sedimentary facies (Lower): Fluvial
• Lithofacies: Sandstone dominant

• Thickness: 160 m
• Upper limit (Kazusa Group): Erosion surface by the low sea level formed during marine oxygen isotope stage (MIS)12
• Upper limit: Unconformity (Kazusa Group)

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

• Distribution: Hitachi terraces- Tsukuba terraces, Ibaraki pref.; Anegasaki area, Chiba pref.; Omiya terrace, Saitama pref.

• Sakata et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.5, pp.331-346 DOI
• Nanayama et al. (2016) Geology of the Mobara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
• Naya and Yasuhara (2014) Geology of the Konosu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 82p. (in Japanese with English abstract 3p.)
• Ooi et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.7, pp.488-505 DOI
• Ooi and Yokoyama (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.103-120 DOI
• Nakazawa and Tanabe (2011) Geology of the Noda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 72p. (in Japanese with English abstract 3p.)
• Nakazawa et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.2, pp.49-63 DOI
• Nakajima and Watanabe (2005) Geology of the Futtsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 102p. (in Japanese with English abstract 8p.)
• Komatsubara et al. (2004) Geology of the Kisarazu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 64p. (in Japanese with English abstract 3p.)
• Nakazawa and Endo (2002) Geology of the Omiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 41p. (in Japanese with English abstract 3p.)
• Tokuhashi and Endo (1984) Geology of the Anesaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 6p.)