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Kn-KD Tephra (Iwasaki et al., 1984) Yamamoto, 1999

Abbr.: Kn-KD

Invalid synonym: Kurodahara Tephra

• Tephra
• Pleistocene (0.24 - 0.23 Ma, Radiometric dating)
• Correlation: Hinataosoroshinotaki Pyroclastic Flow Deposit

• Lithofacies: Orthopyroxene hornblende dacite
• Lithofacies: Lapilli

• Source: Mount Kinunuma
• Host: Hoshakuji Loam
• Thickness: 4 - 8 cm

• Distribution: Mamiana town, Utsunomiya city, Tochigi pref.; Hoshakuji, Takanezawa city, Shioya county, Tochigi pref.

• Yoshikawa et al. (2010) Geology of the Utsunomiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 6p.)