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Chaya Sandstone and Mudstone Member Araki, 1960
Invalid synonym: Yakuoji Formation
- Type locality: Iga street, Chaya, Inaba town, Tsu city, Mie prefecture
- Coherent formation
- Miocene sediments related to the paleo Setouchi inner sea
- early Miocene
- Sedimentary facies: Marine
- Water temperature: Subtropical (Foraminifera)
- Lithofacies: Sandstone
- Lithofacies (Minor): Mudstone, Siltstone, Sandy siltstone
- Sedimentary structures: Parallel stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Inaba town - Shoda town - Hase town - Shibukuro town, Tsu city, Mie pref.
- Fossils (Shellfishes): Clinocardium andoi, Ostrea sp.
- Fossils (Foraminifera): Globigerina angustiumbilicata, Globigerina connecta, Globigerina druryi, Globigerina falconensis, Globigerina foliata, Globigerina praebulloides praebulloides, Globigerina praebulloides pseudociperoensis, Globigerina woodi, Globigerinita glutinata, Globigerinoides japonicus, Globigerinoides quadrilobatus immaturus, Globigerinoides quadrilobatus sacculifer, Globigerinoides quadrilobatus trilobus, Globigerinoides sicanus, Globigerinoides subquadratus, Globoquadrina altispira, Globoquadrina baroemoensis, Globoquadrina aff. venezuelana, Globorotalia birnageae, Globorotalia mayeri, Globorotalia semivera, Globorotalia obesa, Globorotalia scitula praescitula, Globorotalia miozea, Globorotaloides suteri, Neogloboquadrina continuosa, Prosphaeroidinella disjuncta
- Fossils (Diatoms): Coscinodiscus marginatus, Coscinodiscus spp. Stephanopyxis spp., Thalassionema nitzschioides, Crucidenticula sawamurae, Crucidenticula ikebei
- Oshida et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.11, pp.919-933 DOI
- Yoshida et al. (1995) Geology of the Tsu-Seibu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 6p.)