Oshika Scoria Group

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Oshika Scoria Group

Tephra
Pleistocene
Correlation: Hanabusa Loam, Takazawa Scoria

Lithofacies: Scoria

Host: Maibara Loam, Akashio Loam
Upper limit: Unconformity (Shibuegawa Pyroclastic Flow Deposit)
Lower limit: Unconformity (Terao Pyroclastic Flow Deposit, Karayama Landslide Deposits, Hikarigahara Landslide Deposits)

Maibara Loam
[ Upper ]
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Oshika Scoria Group
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[ Lower ]

Shinanogawa Loam
[ Upper ]
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Kaisaka Loam
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Maibara Loam
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Taniage Loam
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Takaba Loam
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[ Lower ]

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

Distribution: Niigata pref.

Yanagisawa et al. (2000) Geology of the Iiyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 144p. (in Japanese with English abstract 6p.)