Iga Member

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Iga Member

Type locality: Kurosaki mine, Tsukigase, Nara city, Nara prefecture
Coherent formation
Pliocene
Correlation: upper Yono Member

Sedimentary facies: Terrestrial
Lithofacies: Clay-dominant interbedded sands and clay
Lithofacies (Minor): Lignite, Volcanic ash
Sedimentary structures: Trough cross-stratification, Parallel stratification, Current ripples

Thickness: 20 - 40 m
Upper limit: Unconformity (Kitamata Gravel Member)

Ueno Formation (Shimagahara, Mie pref.)
[ Upper ]
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Iga Member
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[ Lower ]

Kobiwako Group
[ Upper ]
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Takashima Formation
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Katata Formation
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Kusatsu Formation
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Gamo Formation
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Koka Formation
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Ayama Formation
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Iga Formation
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Ueno Formation
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[ Lower ]

Second Setouchi Supergroup (Shiga pref.)
[ Upper ]
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Kobiwako Group
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[ Lower ]

[ Upper ]
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Second Setouchi Supergroup
?--?--?--?--?-
First Setouchi Supergroup
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Kurosaki mine - Ishiuchi - Nagahiki, Tsukigase, Nara city, Nara pref.; Shimagahara - Uyama - Yubuta - Sangenya, Iga city, Mie pref.; Oyama - Kamide- Nagahiki, Minamiyamashiro city, Soraku county, Kyoto pref.
Tephra: Ida, Aobadai I, Aobadai II, Aobadai III, Kaminosho I, Kaminosho II

Kawabe et al. (1996) Geology of the Ueno District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 99p. (in Japanese with English abstract 5p.)