Nagoro Sandstone Member

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Nagoro Sandstone Member Noda et al., 2021

Type locality: Nagoro - Horita, Manno city, Nakatado county, Kagawa prefecture
Coherent formation
Izumi sedimentary basin
Forearc basin associated with strike-slip fault related to Median Tectonic Line
Late Cretaceous, middle Campanian (80.8 Ma, U-Pb)

Sedimentary facies: Upper - Lower submarine fan
Sedimentary facies: High-density turbidity current
Lithofacies: Sandstone-dominant interbedded sandstone and mudstone
Lithofacies (Minor): Conglomerate, Felsic tuff, Tuffaceous sandstone
Sedimentary structures: Channel structure, Graded bedding, Load cast

Thickness: 1,800 m
Upper limit: Bottom of mudstone-dominant interbedded sandstone and mudstone
Upper limit: Transitional (Katsuura Mudstone Member)
Lower limit: Conformity (Hiketa Formation, Ashiro Mudstone Member)

Horita Formation
[ Upper ]
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Katsuura Mudstone Member
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Nagoro Sandstone Member
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[ Lower ]

Main facies (Sanuki mountains, Tokushima pref.)
[ Upper ]
'''''''/,,,,,,
Bandodani Formation
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Higaidani Formation
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Horita Formation
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Takikubo Formation
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[ Lower ]

Izumi Group
[ North ]
~~~~~~~~~~~~~~
Northern marginal facies
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Main facies
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Southern facies
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[ South ]

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

Distribution: Nagoro - Horita - Mount Daisenzan - Nodagoyagawa river - Mount Kasagatayama - Dokigawa river - Noguchigawa river - Shimobuke, Manno city, Nakatado county, Kagawa pref.; Tachino, Miyoshi city, Tokushima pref.
Fossils: Corals, Trace fossils (Archaeozostera isp.), Radiolarians

Noda et al. (2021) Geology of the Ikeda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 150p. (in Japanese with English abstract 5p.)