[ Top ] [ Japanese ]

Nakijin Formation

• Type locality: Nakijin city, Okinawa prefecture
• Accretionary complex
• Deposition (Limestone): Carnian - Norian, Late Triassic (Conodonts)
• Accretion: Early Cretaceous

• Sedimentary facies: Marine, , Lower slope of a seamount in the open sea - Deep sea floor
• Lithofacies (Upper): Clastic limestone, Bioclastic packstone
• Lithofacies (Main): Turbidite (Bedded micritic limestone with calcareous shale thin beds), Radiolarian lime-mudstone
• Sedimentary structures: Slump structures, Graded beddings, Parallel stratification, Cross stratification

• Thickness: 400 m
• Upper limit: Hedodaki Fault
• Lower limit: Hedo Tectonic Line = Butsuzo Tectonic Line

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

• Distribution: Cape Hedo, Kunigami city - Motobu peninsula, Okinawa pref.
• Fossils: Ammonoids, Halobia sp., Bivalves, Echinoids, Crinoids, Foraminifera, Calcaresou algae
• Ammonoids: Discotropites sulcatus (Calcara), Sirenites cf. nanseni Tozer, Califormites? sp., Traskites sp., Leconteiceras? sp.

• Yamashita et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.9, pp.477-493, DOI
• Miyagi et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.10, pp.665-678 DOI