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Kirizumi Formation

• Volcanic rocks
• Pliocene?

• Lithofacies: Volcaniclastic rocks

• Lower limit: Unconformity (Koneyama Formation, Itahana Formation)

• Distribution: Gunma pref.

• Geshi and Takeuchi (2012) Geology of the Haruna San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)