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Kanbara Group (Urabe et al., 2006)

• Coherent formation
• middle Pleistocene (ca. 300 - 18 Ma)

• Sedimentary facies: Marine, Brackish, Freshwater
• Sedimentary facies: Tidal delta
• Climate: Subalpine (Pollen)
• Lithofacies: Silt, Sandy silt
• Lithofacies (Minor): Sands, Gravels, Peat, Pumice beds

• Thickness: 450 - 700 m
• Upper limit: Unconformity (Shirone Formation)

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

• Distribution: Niigata pref.
• Fossils (Shellfishes): Acteocina globosa, Fulvia mutica, Glycymeris sp., Olivella japonica, Placamen tiara, Ringicula doliaris, Saccella cf. sematensis, Umbonium costatum, Veremolpha mica
• Fossils (Foraminifera): Ammonia japonica, Ammonia manpukuziensis, Bussella frigida callida, Epstominella tamana, Pseudononion japonicum, Pseudorotalia gaimoardii
• Fossils (Diatoms): Aulacoseira granulata, Eunotia spp.
• Fossils (Pollen): Abies sp., Betula sp., Picea sp., Pinus sp., Tsuga sp.
• Tephra: Nm-MZ, Sn-KB, Sn-KB, Hu-TG, AT
• Deposit: Natural gas

• Kamoi et al. (2016) Geology of the Niigata and Uchino District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 90p. (in Japanese with English abstract 2p.)