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Sakekawa Formation Funayama and Kitamura, 1947

• Type locality: Sake river, Yone, Sakegawa city, Mogami county, Yamagata prefecture
• Coherent formation
• Pliocene (4.3 - 3.7 Ma, FT)
• Correlation: Maruyama Formation

• Sedimentary facies: Marine
• Sedimentary facies: Fore shore, Inner shelf, Outer shelf, Continental slope
• Lithofacies: Sandstone
• Lithofacies (Lower, Minor): Interbedded taffaceous sandstone and mudstone
• Paleocurrent: West - Southwest

• Thickness: 250 - 400 m
• Upper limit: Unconformity (Yamuke Formation)
• Lower limit: Conformity (Nakawatari Formation)
• Lower limit (North): Bottom of NG Tephra
• Lower limit (Center): Bottom of interbedded sandstone and mudstone beds
• Lower limit (North): Bottom of Sandstone bed

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Sake river, Yone, Sakegawa city, Mogami county, Yamagata pref.; Ijyousawa - Nakanose - Niwatsuki, Mamurogawa city, Mogami county, Yamagata pref.
• Fossils: Trace fossils
• Fossils (Lower): Omma-Manganji fauna: Anadara amicula cf. elongata, Chlamys cf. daishakaensis, Clinocardium californiense, Clinocardium chikagawaense, Clinocardium cf. fastosum, Clinocardium aff. fucatum, Clinocardium cf. nuttalli, Dosinia (Phacosoma) jpaonica, Ezocallista? sp., Glycymeris yessoensis, Limatula kurodai, Macoma calcarea, Macoma cf. contabulata, Macoma tokyoensis, Mercenaria stimpsoni, Mizuhopecten cf. yessoensis, Modiolus cf. difficilis, Mya japonica, Nemocardium (Keenaea) samarangae, Neptunea aff. intersculpta, Neverita didyma, Peronidia cf. lutea, Serripes groenlandicus, Spicula (Mactromeris) voyi, Tectonatica cf. janthostomoides, Teredo sp., Thracia cf. kakumana, Thyasira tokunagai, Vasticardium sp., Yabepecten tokunagai, Yoldia (Cnesterium) notabilis
• Tephra: TT-2, NG, SK, IS-1, IS-2

• Moriya et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.8, pp.389-404 DOI
• Moriya et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.1, pp.1-15 DOI
• Tsuchiya (1989) Geology of the Osawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 85p. (in Japanese with English abstract 6p.)