[ Top ] [ Japanese ]

Teradomari Formation Omura, 1927

• Type locality: Southern shore of Okozu-bunsui, Teradomari, Nagaoka city, Niigata prefecture
• Coherent formation
• Distal facies of Nambayama submarine fan
• middle - late Miocene (8.4 - 11.8 Ma, FT)
• Correlation: Yugoya Formation, Sarukuradake Formation, Ogaya Formation, Osawa Formation, Onogawa Hard Shale Member, Tomikura Formation

• Sedimentary facies: Marine
• Sedimentary facies: Abyssal plain, Outer submarine fan
• Sedimentary facies: Turbidite
• Depth of water: Deep marine
• Lithofacies: Mudstone, Interbedded sandstone and mudstone
• Lithofacies (Minor): Sandstone, Tuff
• Sedimentary structures: Ripple cross-stratification
• Paleocurrent: North

• Thickness: 500 m or thicker
• Upper limit: Top of Ndp
• Upper limit: Interfingered (Shiiya Formation)

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

• Distribution: Okozu-bunsui - Nozumi - Gomoto, Teradomari, Nagaoka city, Niigata pref.; Sumiyoshi town, Izumozaki city, Santo county, Niigata pref.; Ishiji, Nishiyama town, Kashiwazaki city, Niigata pref.
• Fossils: Cephalopods (Mizuhobaris izumoensis), Radiolarians (Spongodiscus spp.)
• Fossils (Foraminifera): Ammobaculites sp., Bathysiphon sp., Cassidulina norcrossi, Cribrostomoides cf. subglabosum, Cyclammina cf. ezoensis, Dorothia sp., Epistominella cf. pulchella, Globigerina sp., Globobulimina sp., Globorotalia sp., Goesella sp., Gyroidinoides cf. soldanii, Haplophragmoides sp., Martinottiella communis, Spirosigmoilinella compressa, Uvigerina sp., Valvulineria cf. sadonica, Virgulina sp.
• Tephra: Ka, Ij, Ndp, Nz, Yot, Fa, Nakayama Tuff

• Takano (2011) Jour. Geol. Soc. Japan, vol.117, no.4, pp.238-258 DOI
• Kobayashi et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.11, pp.XVII-XVIII
• Kobayashi et al. (2002) Geology of the Sanjo District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 98p. (in Japanese with English abstract 4p.)
• Kobayashi et al. (1995) Geology of the Kashiwazaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 102p. (in Japanese with English abstract 4p.)
• Kobayashi et al. (1993) Geology of the Izumozaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 91p. (in Japanese with English abstract 4p.)