Seika Formation

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Seika Formation (Mitamura, 1992) Ozaki et al., 2000

Invalid synonym: Inuidani Member, Tsuburo Member

Type locality: Zakuro, Seika city, Sora county, Kyoto prefecture
Coherent formation
Pliocene - Pleistocene

Sedimentary facies: Fluvial, Lacustrine
Lithofacies: Interbedded sands and silt
Lithofacies (Minor): Gravels
Sedimentary structures: Planar cross-stratification, Parallel stratification, Graded bedding, Reversed graded bedding
Paleocurrent: from West

Thickness: ca. 30 - 80 m
Upper limit: Bottom of the horizon of gravel-dominant bed including Hacchoike Tephra.
Upper limit: Transitional (Shodai Formation)
Lower limit: Bottom of the gravel bed around Ss-Pnk
Lower limit: Transitional (Zakuro Member)

Osaka Group (Yawata, Kyoto pref.)
[ Upper ]
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Shodai Formation
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Seika Formation
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Tanabe Formation
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Tomigaoka Formation
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[ Lower ]

Second Setouchi Supergroup (Osaka pref. - Hyogo pref.)
[ Upper ]
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Osaka Group
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[ Lower ]

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

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

Distribution: Zakuro - Inuidani - Yamada - Ueda, Seika city, Sora county, Kyoto pref.; Matsuiyamate, Yawata city, Kyoto pref.; Tsuda, Hirakata city, Osaka pref.; Takayama, Ikoma city, Nara pref.; Nishinokyo town - Misasagi town - Sakyo, Nara city, Nara pref.
Tephra: Ss-Az, Inuidani, Hacchoike, Takanohara
Key bed (Marine clay): Ma 2

Miyachi et al. (2005) Geology of the Kyoto-Seinambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 90p. (in Japanese with English abstract 4p.)
Miyachi et al. (2001) Geology of the Osaka-Tohokubu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 130p. (in Japanese with English abstract 6p.)
Ozaki et al. (2000) Geology of the Nara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 162p. (in Japanese with English abstract 5p.)