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Asojima Formation Utashiro, 1957
- Lithofacies: Sandy mudstone, Interbedded sandstone and mudstone, Calcareous sandstone
- Lithofacies (Minor): Conglomerate, Hornblende pyroxene andesite lava, Breccia, Volcanic conglomerate, Lapilli tuff, Pumice tuff
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Asojima - Shimizutani, Kashiwazaki city, Niigata pref.
- Fossils (Omma-Manganji fauna): Acila divaricata, Anadara (Anadara) amicula, Anadara satowi ommaensis, Bittium etigoense, Glycymeris yessoensis, Lucinoma acutilineata, Nassarius (Zeuxis) gemmulatus, Natica (Tectonatica) severa, Patinopecten kurosawaensis, Patinopecten yessoensis, Solemya tokunagai, Thyasira (Conchocele) bisecta, Turritella saishuensis, Turritella saishuensis etigoensis, Umbonium (Suchium) suchiense, Venericardia (Cyclocardia) ferruginea, Venus (Mercenaria) chitaniana, Yoldia naganumana, Yoldia thraciaeformis scaph
- Fossils (Foraminifera): Globigerina bulloides, Globigerina falconensis, Globigerina foliata, Globigerina incompta, Globigerina pachyderma, Globigerina quinqueloba, Globigerina rubescens, Globigerina umbilicata, Globigerinita glutinata, Globigerinita uvula, Globorotaria inflata praeinflata, Globorotalia orientaris, Globorotalia cf. praescitula, Neogloboquadrina asanoi, Neogloboquadrina kagaensis
- Tephra: Asojima I Tuff, Asojima II Tuff
- Kobayashi et al. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)