Tomari Formation

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Tomari Formation

Coherent formation
middle Miocene - Pliocene
Contemporaneous heterotopic facies: Sarugamori Formation

Sedimentary facies: Shallow marine, Brackish, Freshwater
Lithofacies: Andesitic pyroclastic rocks, Interbedded sandstone and mudstone
Lithofacies (Upper, Minor): Acidic tuff
Lithofacies (Lower, Minor): Pumice tuff

Upper limit (North, Sarugamori facies): Unconformity (Sunagomata Formation)
Upper limit (South): Conformity (Sunagomata Formation)
Lower limit: Unconformity (Shiriya Group)

Tomari Formation
[ North ]
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Sarugamori facies = Sarugamori Formation
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Tashiro facies
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Hiyamizu facies
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[ South ]

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

Distribution: Aomori pref.

Imai (1961) Chikagawa, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 45p. (in Japanese with English abstract 4p.)