[ Top ] [ Japanese ]

Iwami Formation (Hyogo prefecture, 1961) Sato et al., 2016

Invalid synonym: Iwami Dacites

• Type locality: Iwami port, Tatsuno city, Hyogo prefecture
• Volcanic rocks
• Late Cretaceous (83.0 Ma, U-Pb; 78.4 Ma, Rb-Sr)
• Intruded by: Rhyolite dikes

• Sedimentary facies: Caldera-fill deposits
• Lithofacies: Pyroclastic flow deposits
• Lithofacies: Biotite hornblende rhyolite welded crystalline tuff

• Thickness: ca. 180 m

• Distribution: Iwami port - Ikariiwa - Mitsu town - Nakanokaranijima island - Okinokarnijima island - Cape Kurosaki, Tatsuno city, Hyogo pref.

• Sato et al. (2016) Geology of the Banshu-Ako District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 68p. (in Japanese with English abstract 3p.)