Hiketa Formation

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Hiketa Formation

Type locality: Hiketa, Higashikagawa city, Kagawa prefecture
Coherent formation
Izumi sedimentary basin
Forearc basin associated with strike-slip fault related to Median Tectonic Line
Late Cretaceous, Campanian (Ammonoids, Paleomagnetism)
Interfingered: Takikubo Formation

Sedimentary facies: Northern margin of the sedimentary basin
Sedimentary facies: non-Turbidite
Depth of water: Outer shelf
Lithofacies: Sandy mudstone

Northern marginal facies (Asan mountains, Kagawa pref.)
[ Upper ]
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Hiketa Formation
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Shiroyama 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: Doki river, Manno city, Nakatado county, Kagawa pref.; Hiketa, Higashikagawa city, Kagawa pref.; Maruyama - Mount Bodaiyama, Kanonji city, Kagawa pref.; Kochi - Lake Sakaseike - Yakushitoge pass, Mitoyo city, Kagawa pref.
Fossils: Ammonoids
Fossils (Bivalves): Thyasira sp., Periplomya sp., Portlandia sp.

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.)
Yoshikawa et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.9, pp.523-537 DOI