[ Top ] [ Japanese ]

Ashiu Sandstone Member (Tsuda, 1953) Nakajima et al., 2019

• Type locality: Jinzu river, Ashu, Toyama city, Toyama prefecture
• Coherent formation
• early Miocene

• Sedimentary facies: Marine or Lacustrine
• Sedimentary facies: Storm-dominated shelf
• Sedimentary facies: Upper shoreface, Lower shoreface, Inner bay
• Lithofacies: Sandstone
• Lithofacies (Minor): Siltstone

• Thickness: ca. 80 - 140 m
• Upper limit: Interfingered (Myogashima Alternation Member), Unconformity (Iwaine Formation)
• Lower limit: Interfengered (Imozu Conglomerate Member), Unconformity (Granite)

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

• Distribution: Ashu - Myogashima - Togagawa river - Kiridani - Suno - Oritani - Teide - Taniori pass, Toyama city, Toyama pref.; Toga town, Nanto city, Toyama pref.
• Fossils: Trace fossils

• Nakajima et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.7, pp.483-516 DOI
• Nozawa et al. (1981) Geology of the Shirokimine District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 10p.)
• Sumi and Nozawa (1973) Geology of the Uozu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 104p. (in Japanese with English abstract 5p.)
• Sakamoto and Nozawa (1960) Yatsuo, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 8p.)
• Nozawa and Sakamoto (1960) Gohyakkoku, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 68p. (in Japanese with English abstract 10p.)