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Furusekigawa Formation Matsuda and Mizuno, 1955
- Type locality: Tokiwagawa river, Kitagawa, Minobu city, Minamikoma county, Yamanashi prefecture
- Volcanic rocks
- middle Miocene (? - ca. 14 Ma)
- Correlation: Kayanokitoge Basalt Member
- Sedimentary facies: Marine
- Sedimentary facies: Submarine volcano
- Sedimentary facies: Island arc volcanic activity
- Depth of water: Abbyssal (deeper than CCD)
- Lithofacies: Island arc tholeiite
- Lithofacies: Basalt lava (Pillow lava), Volcanic breccia, Tuff breccia, Hyaloclastite
- Lithofacies (Minor): Andesite volcanic breccia, Hyaloclastite, Lava, Mudstone, Mudstone-dominant interbedded sandstone and mudstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Kitagawa - Nakayashiki - Furuzeki - Ichinose - Tokiwa - Yunooku, Minobu city, Minamikoma county, Yamanashi pref.; south of Lake Shojiko, Fujikawaguchiko city, Minamitsuru county, Yamanashi pref.; Tsuzurasawa, Ichikawamisato city, Nishiyatsushiro county, Yamanashi pref.
- Ozaki and Sugiyama (2018) Geology of the Minobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 169p. (in Japanese with English abstract 7p.)