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Yamairi Formation Shibata, 1974 ex Oide and Fujita, 1975

• Type locality: Mount Omori, Watari city, Watari county, Miyagi prefecture
• Volcanic rocks
• Miocene
• Correlation: Tsunaki Formation

• Lithofacies: Gravelly tuffaceous sandstone, Dacitic tuff, Sandy tuff, Tuff, Pumice tuff, Tuffaceous mudstone
• Lithofacies (Basal): Conglomerate
• Sedimentary structures: Cross stratification

• Thickness: ca. 80 m
• Lower limit: Unconformity (Wariyama Formation, Takadate Formation)

• Distribution: Mount Omori - Mount Karasutoya - Okuma - Wakamiya - Jinguji - Kashima, Watari city, Watari county, Miyagi pref.
• Fossils: Brachiopods, Corals (Flabellum sp.)
• Fossils (Shellfishes): Chlamys miyatokoensis, Lima goliath, Miyagipecten matsumoriensis

• Oide and Fujita (1975) Geology of the Iwanuma District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 27p. (in Japanese with English abstract 4p.)