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Umegasawa Tuff

Invalid synonym: Umegasawa Pumice Tuff, Nitta Tuff, Nitta Tuff Member

It had been considered as a member of Kiyotaki Formation or Nitta Formation.

• Type locality: Umegasawa, Hasama town, Toyoma city, Miyagi prefecture
• Volcanic rocks
• Pleistocene

• Lithofacies: Pumice tuff
• Lithofacies (Bottom): Andesitic tuff

• Host: Takashimizu Formation
• Lower limit: Unconformity (Tatsunokuchi Formation, Kazawa Formation, Tsukidate Formation, Kameoka Formation)

• Distribution: Umegasawa, Hasama town, Toyoma city, Miyagi pref.; Tsukidate - Hachiman, Kurikoma, Kurihara city, Miyagi pref.

• Matsuno (1967) Geology of the Wakayanagi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 24p. (in Japanese with English abstract 5p.)