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Yotsugoya Formation Inoue et al., 2011

• Coherent formation
• Holocene
• Upper: Holocene (ca. 10 - 0 ka)
• Upper: Holocene (Last glacial period - ca. 10 ka)

• Sedimentary facies (Upper): Marine
• Sedimentary facies (Upper): Estuary, Offshore, Shoreface
• Lithofacies (Upper): Mud, Sands
• Lithofacies (Lower): has not been observed

• Thickness: 27 m or thicker
• Lower limit: Conformity (Ryotsuoki Group)

• Distribution: Niigata pref.
• Fossils (Shellfishes): Pitar sp., Umbonium sp., Ungulinidae gen. et sp. indet
• Fossils (Trace fossils): Bichordites monastriensis

• Kamoi et al. (2016) Geology of the Niigata and Uchino District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 90p. (in Japanese with English abstract 2p.)