Ebisukui Mudstone Member

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Ebisukui Mudstone Member (Nakagawa, 1955) Noda et al., 2017

Invalid name: Ebisukui Formation, Ebisukui Mudstone, Ishisago Formation, Sano Formation

Type locality: Mount Unpenjisan, Onohara town, Kanonji city, Kagawa prefecture
Coherent formation
Izumi sedimentary basin
Forearc basin associated with strike-slip fault related to Median Tectonic Line
Late Cretaceous, middle - late Campanian (80.8 Ma, U-Pb)
Interfingered: Hiketa Formation
Intruded by: Felsic volcanic rock dikes

Lithofacies: Mudstone-dominant interbedded sandstone and mudstone
Lithofacies (Minor): Felsic tuff

Thickness: 1,000 m
Upper limit: bottom of the horizon of sandstone-dominant interbedded sandstone and mudstone
Upper limit: Transitional (Unpenji Sandstone Member)
Lower limit: top of a thick felsic tuff
Lower limit: Transitional (Tanono Sandstone Member)

Takikubo Formation
[ Upper ]
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Ashiro Mudstone Member
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Unpenji Sandstone Member
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Ebisukui Mudstone Member
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Tanono Sandstone Member
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Minoura Sandstone and Mudstone 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 ]
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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: Ebisukui - Awai dam - Tanono - Manda tunnel, Kanonji city, Kagawa pref.; Lake Sakaseike, Mitoyo city, Kagawa pref.; Ushikaino, Shikokuchuo city, Ehime pref.; Sano, Miyoshi city, Tokushima pref.
Fossils: Echinoids (Hemiaster sp.), Inoceramus balticus var. toyajoanus
Fossils (Radiolarians): Afens liriodes, Amphipternis stocki (<= Amphipyndax stocki), Amphipyndax pseudoconulus (<= Amphipyndax enesseffi), Amphipyndax tylotus, Archaeospongoprunum hueyi, Dictyomitra andersoni (<= Dictyomitra tiara), Dictyomitra koslovae, Dictyomitra multicostata, Lithomelissa heros, Pseudotheocampe abschnitta, Stichomitra asymbatos, Theocampe altamontensis

Noda et al. (2017) Geology of the Kan-onji District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 96p. (in Japanese with English abstract 4p.)