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John Beach Volcanics Saito et al., 1989

• Type locality: John Beach, Maruberi bay, Chichijima, Ogasawara city, Tokyo
• Volcanic rocks
• Eocene
• Intruded by: Andesite, Dacite dykes

• Lithofacies: Island arc tholeiite series
• Lithofacies: Lobate sheet lava, Submarine pahoehoe lava

• Thickness (Dykes): 3 - 5 m
• Upper limit: Unconformity (Minamizaki Formation, Maruberiwan Formation)

• Distribution: John Beach, Chichijima, Ogasawara city, Tokyo

• Umino et al. (2016) Geology of the Hahajima Retto District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 46p. (in Japanese with English abstract 2p.)
• Umino and Nakano (2007) Geology of the Chichijima Retto District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 71p. (in Japanese with English abstract 3p.)