[ Top ] [ Japanese ]

Miyashita Mudstone Member

• Type locality: Tadami river, Miyashita, Mishima city, Onuma county, Fukushima prefecture
• Coherent formation
• Small basin between lava domes
• middle Miocene (Microfossils)

• Lithofacies: Sandstone, Siltstone
• Lithofacies (Minor): Rhyolite volcanic sandstone, Tuff
• Sedimentary structures (Minor): Parallel stratification

• Thickness: 300 m or thicker

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

• Distribution: Oishida - Oya - Miyashita, Mishima city, Onuma county, Fukushima pref.
• Fossils (Foraminifera): Angulogerina kokozuraensis, Anomalinoides glabratus, Bathysiphon? sp., Bolivina aff. robusta, Cibicides sp., Cibicidoides malloryi, Cyclammina cf. incisa, Dentalina sp., Elphidium spp., Globigerina angustiumbilicata, Globigerina cf. druryi, Globigerina falconensis, Globigerina foliata, Globigerina praebulloides praebulloides, Globigerina praebulloides pseudociperoensia, Globigerina woodi, Globigerinella obesa, Globigerinita glutinata, Globigerinoides immaturus, Globigerinoides mitra, Globigerinoides parawoodi, Globigerinoides quadrilobaus, Globigerinoides subquadratus, Globigerinoides trilobus, Globobulimina sp., Globocassidulina sp., Globoquadrina altispira altispira, Globoquadrina altispira globosa, Globoquadrina baroemoenensis, Globoquadrina dehiscens, Globoquadrina venezuelana, Globorotalia archeomendii, Globorotalia birnageae, Globorotalia conica, Globorotalia continuosa, Globorotalia mayeri, Globorotalia minutissima, Globorotalia peripheroronda, Globorotalia praescitula, Globorotalia quinifalcata, Globorotalia zealandica, Goesella schencki, Gyroidina cf. soldanii, Lagena spp., Martinottiella communis, Melonis pompilioides, Nodogenerina lepidula, Nonionellina sp., Orthomorphina? sp., Praeorbulina glomerosa circularis, Praeorbulina glomerosa cuva, Praeorbulina glomerosa glomerosa, Praeorbulina sicana, Rosalina spp., Rutherfordoides bradyi, Sphaeroidina japonica, Sphaeroidinellopsis disjuncta, Sphaeroidinellopsis seminulina, Spirosigmoilinella compressa, Uvigerina proboscidea, Valvulineria? sp.
• Fossils (Calcareous nannofossils): Calcidiscus macintyrei, Coccolithus miopelagicus, Coccolithus pelagicus, Cyclicargolithus floridanus, Discoaster deflanarei, Discoaster intercalaris, Discoaster variabilis, Helicosphaera carteri var. carteri, Reticulofenestra gelida, Reticulofenestra haqii, Reticulofenestra minutula, Reticulofenestra perplexa, Reticulofenestra producta, Reticulofenestra pseudoumbilica, Sphenolithus compactus, Sphenolithus heteromorphus, Sphenolithus moriformis

• Yamamoto and Komazawa (2004) Geology of the Miyashita District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 71p. (in Japanese with English abstract 5p.)