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Nozoki Formation Kato, 1949

• Type locality: Hokizawa - Shione river, Mamurogawa city (former Nozoki city), Mogami county, Yamagata prefecture
• Volcanic rocks
• Miocene
• Intruded by: Rhyolite, Dacite, Andesite, Basalt
• Correlation: Omata Formation, lower Aniai Formation, Oarasawa Formation

• Sedimentary facies (Upper): Terrestrial
• Sedimentary facies (Lower): Marine
• Lithofacies (Upper): Pyroxene-bearing dacite, Pyroxene-bearing hornblende biotite rhyolite volicaniclastic rocks
• Lithofacies (Middle): Pyroxene andesite volcaniclastic rocks
• Lithofacies (Middle, Minor): Pyroxene olivine andesitic basalt volcaniclastic rocks
• Lithofacies (Lower): Pyroxene andesite volcaniclastic rocks
• Lithofacies (Lower, Minor): Pyroxene olivine basalt volcaniclastic rocks
• Lithofacies (Minor): Lava, Tuffaceous mudstone, Tuffaceous sandstone

• Thickness: 1,200 m or thicker
• Upper limit: Conformity, partly unconformity (Kaneyama Formation), Unconformity (Torakeyama Formation)
• Lower limit: Unconformity

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

• Distribution: Hokizawa - Shione river, Mamurogawa city, Mogami county, Yamagata pref.
• Fossils (Shellfishes): Acila sp., Hyalopecten sp.

• Ozawa and Sumi (1961) Uzenkaneyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 66p. (in Japanese with English abstract 5p.)