[ Top ] [ Japanese ]

Mikusu Block-and-Ash Flow Deposits (Tsunozu Research Group, 1972) Kano et al., 2001

Invalid synonym: Yataki Tuff Breccia

• Type locality: Mikusu, Oda city, Shimane prefecture
• Volcanic rocks
• Pleistocene
• Interfingered: Shimanohoshi Formation
• Intruded by: Oe-Takayama Lava

• Sedimentary facies: Terrestrial
• Sedimentary facies (Basal): Volcanic surge deposits
• Lithofacies: Hornblende biotite dacite volcanic blocks, Lapilli
• Sedimentary structures: Graded bedding, Low-angle cross stratification

• Mode of eruption (Basal): Phreatomagmatic
• Thickness: ca. 20 m
• Upper limit: Unconformity (Oe-Takayama Lava)
• Lower limit: Unconformity (Yataki Ash Flow Deposits)

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

• Distribution: Mikusu - Yataki, Oda city, Shimane pref.

• Kano et al. (2001) Geology of the Yunotsu and Gotsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 129p. (in Japanese with English abstract 5p.)