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Hop Tephra Kazaoka, 1986

Abbr.: Hop

• Type locality: Hosue, Oguni town, Nagaoka city, Niiagata prefecture
• Tephra
• Pleistocene

• Lithofacies (Upper): Rhyolite vitreous volcanic ash
• Lithofacies (Middle): Rhyolite pumiceous volcanic ash
• Lithofacies (Lower): Rhyolite vitreous volcanic ash
• Sedimentary structures (Upper): Cross stratification

• Thickness: 2 - 12 m
• Thickness (Upper): 1 - 5 m
• Thickness (Middle): 1 - 3.5 m
• Thickness (Lower): 1 - 5 m
• Host: Uonuma Formation

• Distribution: Hosue, Oguni town, Nagaoka city, Niiagata pref.

• Kobayashi et al. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)
• Yanagisawa et al. (1986) Geology of the Ojiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 177p. (in Japanese with English abstract 6p.)