[ Top ] [ Japanese ]

Tachikawa Loam Kanto Loam Research Group, 1956

Invalid synonym: Kokubunji Loam, Takikubo Loam, Aoyagi Member, Aoyagi Loam

• Type locality: Okamoto, Setagaya ward, Tokyo
• Loam
• Pleistocene (40 - 12 ka; 17,000 yBP, 32 - 12 ka¹⁴C, MIS 3 -2)
• Correlation: Osato Loam
• Correlation (Lower): Younger Loam

• Climate: Cooler - Temperate (Pollen)
• Lithofacies: reddish brown Loam
• Sedimentation rate (after AT): ca. 10 mm/1,000 years

• Thickness: 0.5 - 12 m
• Upper limit: Unconformity (Akiruppara Formation)
• Lower limit: Top of the brown-color crack band 3 - 4 m below the ground surface
• Lower limit: Conformity (Tachikawa Terrace Deposits, Musashino Loam, T₂ River Terrace Deposit, Nakatsuhara Terrace Deposit, Nanso I Terrace Deposits), Unconformity (Ayasegawa Terrace Deposit, Tama II Loam, Tachikawa 1 Formation, Tachikawa 2 Formation, Aoyagi Formation, Toshitorazu Formation, Nakadai Formation, Zengyo Gravel, Sagamihara Terrace Deposit, Dai Gravel, Nanso II Terrace Deposits, Nanso III Terrace Deposits, Isumi 1 (Yoshifu) Terrace Deposit, Isumi 2 Terrace Deposit, Isumi 3 Terrace Deposit, Nagaogawa IV Terrace Deposit, Nagaogawa V Terrace Deposit, Nagaogawa VI Terrace Deposit)

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

• Distribution: Okamoto, Setagaya ward, Tokyo
• Tephra: AT, As-UG, F-S1S, Aoyagi Scoria, Tanahara Pumice, AS-4, AG, Chj, Is

• Utsunomiya and Ooi (2019) Geology of the Kazusa-Ohara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)
• Nakazawa et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.5, pp.367-385 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.)
• 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.)
• Ueki and Sakai (2007) Geology of the Ome District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 189p. (in Japanese with English abstract 5p.)
• Kawakami and Shishikura (2006) Geology of the Tateyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 82p. (in Japanese with English abstract 5p.)
• 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.)
• Oka et al. (1984) Geology of the Tokyo-Seinambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 148p. (in Japanese with English abstract 7p.)
• Kodama et al. (1980) Geology of the Misaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 38p. (in Japanese with English abstract 3p.)