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Yurakucho Formation Aoki, 1969

Invalid synonym: Yatsuka Formation (Saitama pref.)

• Type locality: Yurakucho, Chiyoda-ku, Tokyo
• Coherent formation
• Oku-Tokyo bay (Inner bay)
• Pleistocene - Holocene (12 ka - )

• Sedimentary facies: Marine, Fluvial
• Sedimentary facies (Upper): Delta (Delta plain), Fluvial channel-fill, Flood plain
• Sedimentary facies (Middle): Delta (Prodelta, Delta front), Sand spit, Estuary
• Sedimentary facies (Lower): Estuary
• Lithofacies (Upper): Sands, Mud
• Lithofacies (Middle): Sands, Mud
• Lithofacies (Lower): Sands

• Lower limit: Conformity (12 - 11 ka, -40 to -35 m altitudes)

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

• Distribution: Tokyo lowland, Tokyo; Nakagawa lowland, Saitama pref.
• Distribution: Unemeshinden, Misato city, Saitama pref.
• Fossils: Diatoms (Marine, Brackish)

• Tanabe and Ishihara (2013) Jour. Geol. Soc. Japan, vol.119 no.5, pp.350-367 DOI
• Tanabe et al. (2012) Jour. Geol. Soc. Japan, vol.118, no.1, pp.1-19 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.)
• Tanabe et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.5, pp.252-269 DOI
• Tanabe et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.2, pp.85-98 DOI
• Eto et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.4, pp.187-199 DOI