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Oga Pumice Tuff Shikano et al., 2011
Abbr.: Oga
Synonym: Oga pmt
- Tephra
- Pleistocene (0.42 Ma, 0.39 Ma, FT; 0.42 Ma, Ar-Ar)
- Sedimentary facies: Pyroclastic surge deposit
- Lithofacies: Biotite-bearing rhyolitic pumice lapilli tuff, Tuff
- Sedimentary structures: Graded bedding, Parallel stratification, Low angle cross-stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Anden seashore - Wakimoto, Oga city, Akita pref.
- Fossils (Diatoms): Achnanthes sp., Actinocyclus ingens f. ingens, Actinocyclus normanii, Actinoptyclus senarius, Adoneis pacifica, Aulacoseira spp., Azpeitia nodulifera, Cocconeis californica, Cocconeis costata, Cocconeis curviritunda, Cocconeis scutellum, Coscinodiscus marginatus, Coscinodiscus radiatus, Cyclotella striata, Cymabella sp., Delphineis surirella, Denticulopsis lauta, Denticulopsis simonsenii, Denticulopsis vulgaris, Diploneis bombus, Diploneis smithii, Epithemia sp., Grammatophora spp., Hyalodiscus radiatus, Melosira sp., Navicula sp., Neodenticula kamtschatica, Neodenticula koizumii, Neodenticula seminae, Paralia sulcata, Pinnularia sp., Proboscia barboi, Proboscia curvirostris, Rhabdonema japonicum, Rhizosolenia hebetata f. hiemalis, Rhizosolenia styliformis, Rhopalodia sp., Stellarima microtrias, Stephanodiscus sp., Stephanopyxis dimorpha, Stephanopyxis horidus, Synedra ulna, Tetracyclus spp., Thalassionema bacillaris, Thalassionema hirosakiensis, Thalassionema nitzschioides, Thalassiosira leptopus, Thalassiosira oestrupii, Thalassiothrix longissima
- Kano et al. (2011) Geology of the Toga and Funakawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 127p. (in Japanese with English abstract 4p.)
- Ohguchi et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.17-32 DOI
- Fujimoto et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.51-74 DOI