[ Top ] [ Japanese ]

Sarukuradake Formation Kobayashi et al., 1991

• Type locality: Koryu shrine, Yomogihira, Nagaoka city, Niigata prefecture
• Coherent formation
• middle - late Miocene
• Correlation: Teradomari Formation

• Water temperature: Stagnent water (Foraminifera)
• Depth of water: Upper - Lower bathyal (Foraminifera)
• Lithofacies: Shale
• Lithofacies (Minor): Tuff

• Thickness: 300 m or thicker
• Upper limit: Conformity (Kakuma Formation)

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

• Distribution: Mount Sarukura, Yomogihira, Nagaoka city, Niigata pref.; Higashiyama - Kaya pass - Suyoshi river, Nagaoka city, Niigata pref.
• Fossils (Foraminifera): Ammodiscoides japonica, Bathysiphon sp., Cribrostomoides cf. evoluta, Cribrostomoides cf. subglobosum, Cyclammina japonica, Cyclammina pusilla, Dorothia sp., Martinottiella communis, Spirosigmoilinella compressa

• Kobayashi et al. (1991) Geology of the Nagaoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 132p. (in Japanese with English abstract 6p.)