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Nakaoku Formation

• Coherent formation
• Eocene - Miocene
• Correlation: Inamuragadake Conglomerate

• Lithofacies: Conglomerate
• Lithofacies (Minor): Sandstone, Mudstone
• Sedimentary structures: Wave ripples

• Thickness: a few dozens m
• Lower limit: Unconformity (Daifugendake Complex)

• Distribution: Nakaokugawa river, Kawakami city, Yoshino county, Nara pref.
• Fossils: Plant fragments, Foraminifera (Cyclammina tani, Cyclammina pacifica)

• Shiida et al. (1989) Geology of the Sanjogatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 100p. (in Japanese with English abstract 5p.)