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Yadagawa Group Wadatsumi and Matsumoto, 1958

• Type locality: Yadagawa river, Kami city, Mikata county, Hyogo prefecture
• Volcanic rocks
• Paleocene (62.1 Ma, Rb-Sr)
• Intruded by: Tottori Granite, Kyushozan Granite, Hanabara Complex

• Lithofacies: Biotite rhyolite welded tuff
• Lithofacies (Minor): Rhyolite lava

• Thickness: 300 m or thicker
• Upper limit: Unconformity (Kawabara Volcanic Member, Koge Conglomerate Member, Hokutan Group)

• Distribution: Kami city - Shinonsen city - Yadagawa river, Mikata county, Hyogo pref.; Izushi, Yutakaoka city, Hyogo pref.; Bogaki - Takiyama - Tani - Tamaboko - Okamasu - Yoshino, Tottori city, Tottori pref.; Sasanami - Hanabara, Yazu city, Yazu county, Tottori pref.

• Sugamori (2013) Jour. Geol. Soc. Japan, vol.119, no.5, pp.368-374 DOI
• Sakiyama et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.1-20 DOI
• Uemura et al. (1979) Geology of the Wakasa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 91p. (in Japanese with English abstract 8p.)