Dosaiyama Conglomerate Member

Invalid synonym: Nakajima Conglomerate Member, Ofuchi Formation

Coherent formation
Cretaceous
Intruded by: Gabbro, Diorite

Sedimentary facies: Brackish
Lithofacies (Upper): Conglomerate
Lithofacies (Middle): Interbedded conglomerate and shale, Interbedded sandstone and shale
Lithofacies (Lower): Conglomerate
Lithofacies (Lower, Minor): Sandstone, Shale

Thickness: 370 - 400 m
Thickness (Upper): 100 - 130 m
Thickness (Middle): 100 m or thinner
Thickness (Lower): ca. 50 m
Upper limit: Transitional (Kakunomaesaka Alternation Member)
Lower limit: Unconformity

Itoshiro Subgroup (Ono, Fukui pref.)
[ Upper ]
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Itsuki Formation
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Kakunomaesaka Alternation Member
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Dosaiyama Conglomerate Member
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[ Lower ]

Tetori Group
[ Upper ]
~~~~~~~~~~~~~~
Akaiwa Subgroup
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Itoshiro Subgroup
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Amagashiradani valley - Kawai - Tomedoro - Otani - Mochiana - Nagano - Katsurajimagawa river - Yugami - Shimoyama - Yanbara - Hakogase - Fujikuradani valley - Mount Dosaiyama - Nakajima - Shimoise, Ono city, Fukui pref.
Fossils (Shellfishes): Batissa antiqua, Batissa yokoyamai, Corbicula (Mesocorbicula) tetoriensis, Corbicula (Tetoria) antiqua, Melanoides vulgaris, Melanoides vulgaris minimus, Nakamuranaia ? sp., Ostrea sp., Polymesoda (Isodomella) sp., Trigonioides sp., Viviparis (Sinotaia?) onogoensis, Volsella? sp.
Fossils (Plants): Equisetites ushimarensis, Cladophlebis cf. argutula, Cladophlebis denticulata, Cladophlebis distans, Cladophlebis exiliformis, Cladophlebis hukuiensis?, Czecamoswkia rigida, Dictyozamites cf. kawasakii, Gleichenites nipponensis, Nilssonia orientalis, Onychiopsis elongata, Podozamites griesbachi, Podozamites lanceclatus, Pseudocycus? acutifolia, Sphenopteris cf. goepperti

Kawai (1964) Neo, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 66p. (in Japanese with English abstract 12p.)
Kawai et al. (1957) Arashimadake, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 110p. (in Japanese with English abstract 13p.)