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Doyama Tuffaceous Member

Invalid synonym: Doyama Formation

• Volcanic rocks
• early - late Miocene
• Correlation: Nanamagari Tuff Member

• Sedimentary facies: Marine
• Lithofacies (Upper): Sandstone
• Lithofacies (Upper, Minor): Tuff
• Lithofacies (Middle): Tuffaceous mudstone
• Lithofacies (Lower): Pumiceous sandstone
• Lithofacies (Lower, Minor): Rhyolite tuff breccia, Tuffaceous mudstone
• Sedimentary structures (Upper): Cross stratification
• Sedimentary structures (Lower): Cross stratification

• Thickness (Upper): 10 - 120 m
• Thickness (Middle): 15 - 20 m
• Thickness (Lower): ca. 20 m

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

• Distribution: Toyama pref.
• Fossils (Shellfishes): Nuculana cfr. nidatoriensis, Propeamusium tateiwai

• Inoue et al. (1964) Johana, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 32p. (in Japanese with English abstract 5p.)