Fukkiura Shale and Sandstone Member

Type locality: Fukkiura, Ishinomaki city, Miyagi prefecture
Coherent formation
Late Jurassic, Kimmeridgian - Tithonian

Sedimentary facies: Delta front, Prodelta
Sedimentary facies: Turbidite
Lithofacies: Interbedded shale and sandstone
Sedimentary structures: Cross stratification, Convolute lamination, Graded bedding, Sole marks, Dish structures

Thickness: 550 - 650 m
Lower limit: Bottom of the horizon composed of 10 - 30 m thick medium sandstone and well foliaged shale
Lower limit: Transitional (Kozumi Shale Member)

Oginohama Formation
[ Upper ]
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Fukkiura Shale and Sandstone Member
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Kozumi Shale Member
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Makinohama Sandstone Member
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Kitsunesaki Sandstone and Shale Member
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[ Lower ]

Ojika Group
[ Upper ]
~~~~~~~~~~~~~~
Ayukawa Formation
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Oginohama Formation
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Tsukinoura Formation
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[ Lower ]

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

Distribution: Fukkiura - Kozumi - Tomarihama - Atsuizaki - Makinosaki - Kukuharihama - Ota pass - Aji island, Ishinomaki city, Miyagi pref.
Fossils (Ammonoids): Aulacosphinctoides? sp., Aulacostephanus (Pararasenia) sp., Perisphinctinid gen. et sp. indet, Virgatosphinctes aff. communis
Fossils (Bivalves): Arctostrea sp., Chlamys? sp., Ctenoides cf. tosanus, Ctenostreon aff. proboscida, Mantellum akiyamae, Myophorella sp., Neithea sp.
Fossils (Trace fossils): Chondrites isp., Cosmorhaphe sp., Scalarituba? isp., Zoophycos isp.

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.)