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Minamizaki Formation Umino, 1985

Invalid synonym: Minamizaki Limestone

• Type locality: Cape Minamizaki, Chichijima, Ogasawara city, Tokyo
• Coherent formation
• Upper: Miocene
• Lower: Oligocene

• Sedimentary facies (Upper): Shallow lagoon, Reef flat
• Sedimentary facies (Lower): Reef edge, Grooves
• Lithofacies: Foraminifera-bearing limestone
• Lithofacies (Upper): Grainstone, Reef limestone
• Lithofacies (Lower): Packstone, Wackestone

• Thickness: 60 m or thicker
• Lower limit: Unconformity (Maruberiwan Formation, John Beach Volcanics)

• Distribution: Cape Minamizaki - Minamijima island, Chichijima, Ogasawara city, Tokyo

• 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.)