Tochizu Alternation of Sandstone and Mudstone Member

Coherent formation
early - late Miocene

Sedimentary facies: Marine
Lithofacies: Interbedded sandstone and mudstone
Lithofacies (Minor): Tuffaceous sandstone, Conglomerate, Andesite lava

Thickness: ca. 150 - 400 m
Upper limit: Conformity (Shakusenji Mudstone Member), Unconformity (Kamidaki Sandstone Member)
Lower limit: Conformity (Kashinoki Conglomerate Member, Zasunbo Alternation of Conglomerate, Sandstone and Mudstone Member, Mekka Pumiceous Tuff Member)

Yatsuo Group (Gohyakkoku, Toyama pref.)
[ Upper ]
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Tochizu Alternation of Sandstone and Mudstone Member
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Kashinoki Conglomerate Member
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Iozen Formation
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Iwaine Formation
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[ Lower ]

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

Distribution: Joganjigawa river - Ikeda, Tateyama city, Nakaniikawa county, Toyama pref.; Kumanogawa river, Toyama city, Toyama pref.
Fossils: Fishes (Bones), Crinoids (Stem)
Fossils (Shellfishes): Acila submirabilis, Anadara ogawai, Barbatia sp., Calliostoma sp., Cancellaria sp., Cardium sp., Caryocorbura nisataiensis, Chlamys nisataiensis, Conus sp., Crassatellites nanus, Cylichna sp., Dentalium sp., Doliocassis japonica, Dosinia nomurai, Felaniella usta, Fulgoraria striata, Glycymeris vestitoides, Inquisitor sp., Lucinisca k-hataii, Lucinisca yokoyamai, Macoma sp., Mactra sp., Megasulcula sp., Mitra sp., Nassarius kometubus, Natica janthostoma, Nucula akitana, Ostrea sp., Panope japonica, Phaxus izumoensis, Pitar itoi, Protrotella sp., Saccella congiensis, Saccella kogiensis, Searlesia kurodai, Sinum ineptum, Solen krusensterni, Trophon sp., Turritella kadonosawaensis tsudai, Turritella kadonosawaensis yoshidai, Venericardia siogamensis, Venerupis (Siratoria) siratoriensis

Sakamoto and Nozawa (1960) Yatsuo, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 8p.)
Nozawa and Sakamoto (1960) Gohyakkoku, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 68p. (in Japanese with English abstract 10p.)