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Hirosegawa Tuff Member (Yabe, 1926) Kitamura et al., 1953

Invalid synonym: Hirosegawa Formation

• Type locality: The right bank of Hirose river, Sendai city, Miyagi prefecture (Hyojogawara, Aoba-ku - Mukaiyama, Taihaku-ku)
• Volcanic rocks
• Pliocene (5.3 - 3.5 Ma, FT)

• Sedimentary facies: Terrestrial
• Sedimentary facies: Pyroclastic flow deposit
• Lithofacies (Upper): Rhyolitic pumice tuff
• Lithofacies (Lower): Volcanic ash

• Thickness: 2 - 15 m
• Thickness (Lower): 50 - 70 cm
• Lower limit: Conformity (Lower main part of Mukaiyama Formation), Abut unconformity (Mitaki Formation)

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

• Distribution: Ayashi, Aoba-ku, Sendai city, Miyagi pref.; Nenoshiroishi, Izumi-ku, Sendai city, Miyagi pref.; Iwanuma city, Miyagi pref.; - Hamadori region, Fukushima pref.
• Fossils (Plants): Cinnamomum scheuchzeri, Liquidambar japonica, Sequoia sp., Metasequoia sp.

• Miyamoto et al. (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.27-46 DOI
• Fujiwara et al. (2013) Jour. Geol. Soc. Japan, vol.119, Supplement, pp.96-119 DOI
• Yanagisawa et al. (1996) Geology of the Somanakamura District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 114p. (in Japanese with English abstract 9p.)
• Kitamura et al. (1986) Geology of the Sendai District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 134p. (in Japanese with English abstract 9p.)
• Oide and Fujita (1975) Geology of the Iwanuma District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 27p. (in Japanese with English abstract 4p.)