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Matsuo Formation (Iizuka, 1929)

Invalid synony: Matsuo Group, Izumikawa Formation

Possibly Shiranezaki Formation is a part of Matsuo Formtaion.

• Type locality: Toya seashore, Toba city, Mie prefecture
• Coherent formation
• Fore-arc basin sediments
• Early Cretaceous, Valanginian - Barremian (138 Ma FT; Shellfishes, Radiolarians)
• Correlation: Nansei Group

• Sedimentary facies: Brackish, Marine
• Lithofacies: Silty mudstone, Sandstone, Mudstone-dominant interbedded sandstone and mudstone
• Lithofacies (Minor): Siliceous tuff
• Lithofacies (Bottom): Conglomerate, Sandstone
• Sedimentary structures: Graded bedding, Trough cross-stratification, Hummocky cross-stratification, Flaser bedding, Channel structure, Cut and fill structure, Convolute lamination, Current marks, Current ripples, Load structures, Flame structures

• Thickness: 150 - 300 m or thicker
• Distribution (Width): 700 m
• Upper limit: Thrust fault (Hatakechaya Ultramafic Rocks)
• Lower limit: Unconformity (Shiranezaki Formation, Aonomine Complex)

• Distribution: Kunagawa seashore - Futaji - Toya seashore - Tohama seashore - Cape Benten - Matsuo - Omurajima island, Toba city, Mie pref.; Izumikawa, Minamiise city, Watarai county, Mie pref.; Tsuiji - Gochitoge pass, Shima city, Mie pref.
• Fossils: superfamily Titanosauridae (Bones), Iguanodon (Footprints), Plants (Ferns, Cycads)
• Fossils (Shellfishes): Aguilerella (Yoshimopsis) nagatoensis, Bakevellia shinanoensis, Eomiodon matsumotoi, Hayamina carinata, Isodomella matsumotoi, Isodomella shiroiensis, Microschiza japonica, Pila? fukamiensis, Protocyprina naumann, Tetoria (Paracorbicula) sanchuensis, Tetoria yoshimoensis
• Fossils (Radiolarians): Allievium sp., Archaeodictyomitra sp., Eucyrtidiellum ptyctum, Eucyrtidiellum unumaense, Eucyrtis tenuis, Gongylothorax favosus, Hemicryptocapsa capita, Novixitus? tuerculatus, Parvicingula sp., Praeconocaryomma? sp., Pseudodictyomitra conicostriata, Pseudodictyomitra nuda, Pseudodictyomitra suyarii, Sethocapsa trachyostraca, Siphocampium? davidi, Syringocapsa sp., Tethysetta dhimenaensis, Thanarla cf. pulchra, Triversus? sp., Williriedellum cf. dierschei, Wrangellium sp., Zhamoidellum ovum, Nassellaria 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