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Tsukinoura Sandstone Member

• Coherent formation
• Middle Jurassic, Bajocian (Ammonoids)

• Lithofacies: Conglomerate, Sandstone
• Lithofacies (Minor): Sandy shale
• Lithofacies (Basal): Conglomerate
• Sedimentary structures: Cross stratification, Parallel stratification, Flute marks, Groove marks
• Paleocurrent: South to North

• Thickness: ca. 10 - 250 m
• Thickness (Basal): 1 - 5 m
• Upper limit: Bottom of the sands-deficient horizon
• Upper limit: Transitional (Samuraihama Shale Member)
• Lower limit: Unconformity (Isatomae Formation)

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

• Distribution: Urashuku - Izushima island, Onagawa city, Oshika county, Miyagi pref.; Hara, Ogachi town, Ishinomaki city, Miyagi pref.; Oura - Maeami, Ishinomaki city, Miyagi pref.
• Fossils: Ammonoids (Normanites (Itinsaites) cf. itinsae, Stephanoceras sp.), Belemnoids
• Fossils (Shellfishes): Bakevellia sp., Chlamys kobayashii, Ctenostreon ojikense, Entolium cf. disciforme, Eomiodon vulgaris, Inoceramus fukadae, Kobayashites hemicylindricus, Lopha spp., Parallelodon sp., Trigonia sumiyagura, Vaugonia kodaijimensis

• Takizawa et al. (1987) Geology of the Yoriiso District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 74p. (in Japanese with English abstract 5p.)
• Takizawa et al. (1984) Geology of the Ishinomaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 7p.)
• Takizawa et al. (1974) Geology of the Kinkasan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 62p. (in Japanese with English abstract 5p.)