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Tsui Formation

• Coherent formation
• Late Jurassic (Radiolarians)

• Sedimentary facies: Marine
• Sedimentary facies: Silent and flat ocean floor with small coral reefs
• Depth of water: Very shallow
• Lithofacies (Main): Interbedded sandstone and mudstone
• Lithofacies (Minor): Sandstone, Mudstone, Conglomerate, Tuff, Limestone (Torinosu Limestone)

• Thickness (Limestone): 20 - 50 m
• Upper limit: Unknown
• Lower limit: Unknown

• Distribution: Azamui - Nogauchi seashore, Saiki city, Oita pref.
• Fossils: Rudists (Epidiceras speciosum), Stromatoporoids (Parastromatopora memoria-naumanni), Sponges (Chaetetopsis crinita), Echinoids (Balanocidaris japonica, Spicules), Radiolarians
• Fossils (Corals): Aplosmilia sp., Acanthogyra sp., Enallheria sp., Isastrea sp., Latomeandra sp., Stylina sp., Thamnasteria sp.
• Fossils (Benthic foraminifera): Charentia cuvillieri, Textularia sp.

• Kakizaki et al. (2015) Jour. Geol. Soc. Japan, vol.121, no.1, pp.19-34 DOI
• Sano et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.9, pp.500-503 DOI