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Nakaumi Formation

Invalid synonym: Nakanoumi Formation

• Coherent formation
• Holocene (10 - 3 yBP, ¹⁴C)

• Sedimentary facies: Marine, Brackish
• Sedimentary facies: Buried valley-fill deposits, Delta deposits, Alluvial fan deposits, Lagoon
• Lithofacies: Mud, Sands, Gravels

• Thickness: 60 m or thinner
• Lower limit: Conformity? (Yasugi Formation)
• Lower limit: Unconformity (Daikonjima Basalt, Eshima Basalt)

• Distribution: Daikon island - Eshima island, Yatsuka village, Matsue city, Shimane pref.
• Fossils: Echinoids
• Fossils (Shellfishes): Anadara broughtonii, Anadara granosa?, Anadara subcrenata, Brachidontes senhausia, Cerithidea djadjariensis, Corbicula japonica, Dentalium hexagonum, Dosinia penicillata, Fulvia kungerfordi, Fulvia mutica, Fusinus perplexus, Lucina stearnsiana, Macoma incongrua, Nassarius eivescens, Paphia undulata, Pecten albicans, Polinices reiniana, Potamocorbula amurensis, Raeta pulchella, Tapes variegata, Theora lubrica, Trisidos tortuosa kiyonoi, Tritia festiva, Veremolpa micra

• Sawada et al. (2009) Jour. Geol. Soc. Japan, vol.115, Supplement, pp.51-70 DOI
• Kano et al. (1998) Geology of the Taisha District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 58p. (in Japanese with English abstract 3p.)
• Kano et al. (1991) Geology of the Imaichi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 79p. (in Japanese with English abstract 5p.)
• Kano and Nakano (1985) Geology of the Mihonoseki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 28p. (in Japanese with English abstract 3p.)
• Kano and Yoshida (1985) Geology of the Sakaiminato District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 57p. (in Japanese with English abstract 5p.)