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Shiranezaki Formation Sugiyama et al., 1993

Possibly a part of Matsuo Group

• Type locality: Toya, Shiranezaki, Toba city, Mie prefecture
• Coherent formation
• Fore-arc basin sediments
• Middle Jurassic, Callovian - Late Jurassic, Oxfordian (Radiolarians)

• Sedimentary facies: Marine
• Lithofacies: Mudstone, Mudstone-dominant interbedded sandstone and mudstone, Sandstone, Sandstone-dominant interbedded sandstone and mudstone
• Sedimentary structures: Trough cross-stratification

• Thickness: 100 m
• Upper limit: Unconformity (Matsuo Group)

• Distribution: Arashima village, Toba city, Mie pref.; Cape Benten, Ijika village, Toba city, Mie pref.
• Fossils (Radiolarians): Archaeodictyomitra apiara, Bernoullium sp., Cinguloturris carpatica, Cryptocapsa sp., Dictyomitrella? kamoensis, Eucyrtidiellum nodosum, Eucyrtidiellum unumaense, Hsuum cf. brevicostatum, Hsuum cf. maxwelli, Loopus cf. nudus, Loopus primitivus, Pseudodictyomitra sp., Sethocapsa sp., Solenotryma ichikawai, Stichomitra sp., Striatojaponocapsa conexa, Stylocapsa catenarum, Stylocapsa? spilaris, Tethysetta dhimenaensis, Tricolocapsa plicarum, Tricolocapsa tetragona, Triversus sp., Unuma cf. echinatus, Williriedellum cf. dierschei, Zhamoidellum ovum, Spumellaria gen. et sp. indet.

• Uchino et al. (2017) Geology of the Toba District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 141p. (in Japanese with English abstract 5p.)
• Uchino and Suzuki (2016) Jour. Geol. Soc. Japan, vol.122, no.5, pp.207-222, DOI
• Ohta et al. (2012) Jour. Geol. Soc. Japan, vol.118, no.9, pp.588-593 DOI