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Sumaizuku Unit (Kamikawa et al., 1997)

Invalid synonym: Suzmaizukuzawa Formation, Nenoyama Formation (Local name in Yokoze city, Saitama pref.)

Possibly a member of Kurosegawa Belt

• Type locality: Sumaizuku, Ueno city, Gunma prefecture
• Accretionary complex
• Deposition (Limestone): Moscovian, late Carboniferous - Artinskian, early Permina (Fusulinids), Wordian, middle Perminan (Fusulinids)
• Deposition (Matrix): Middle Jurassic (Radiolarians)
• Accretion: Jurassic
• Transitional: Yusugawa Formation
• Correlation: Nakato Unit, Funabuseyama Formation or Imajo Formation, Unit I (Ehime pref.)

• Sedimentary facies: Marine
• Lithofacies: Mélange facies
• Matrix: Shale
• Exotic blocks (Crusts): Sandstone
• Exotic blocks (Slab): Chert (Red), Reef limestone, Basalt

• Upper limit: Thrust fault
• Lower limit: Thrust fault

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

• Distribution: Sumaizuku, Ueno city, Gunma pref.; Yonoo, Kanna city, Gunma pref.
• Fossils: Radiolarians
• Fossils (Fusulinids): Fusulinella sp., Triticites sp., Sphaeroschwagerina sphaerica gigas
• Fossils (Calcareous algae): Anthracoporella sp. (family Polyphysaceae)

• Uchino and Suzuki (2017) Jour. Geol. Soc. Japan, vol.123, no.12, pp.1015-1033 DOI
• Hisada et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.7, pp.325-342, DOI