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Yokawa Formation (Ikebe ed., 1961) Ozaki and Matsuura, 1988
- Type locality: Yokawa town, Miki city, Hyogo prefecture
- Coherent formation
- Eocene - Oligocene
- Sedimentary facies: Fluvial, Lacustrine
- Sedimentary facies (Upper): Lacustrine
- Sedimentary facies (Middle): margin of Alluvial fan, Braided river
- Sedimentary facies (Lower): Meandering river, Lacustrine
- Lithofacies (Middle): Conglomerate, Tuff
- Lithofacies (Lower): Sandstone
- Lithofacies (Lower, Minor): Mudstone
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Yokawa town, Miki city, Hyogo pref.; Sanda city, Hyogo pref.; Osawa town - Nagao town - Hata town - Okaba - Taoji, Kobe city, Hyogo pref.; Tojo - Yashiro town, Kato city, Hyogo pref.
- Tephra: Yokawa Tuff
- Ozaki and Matsuura (1988) Geology of the Sanda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 5p.)
- Huzita and Kasama (1983) Geology of the Kobe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 115p. (in Japanese with English abstract 8p.)
- Huzita and Kasama (1982) Geology of the Osaka-Seihokubu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 8p.)