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Harasaka Mudstone Member

• Type locality: Harasaka, Hosokawa town, Miki city, Hyogo prefecture
• Coherent formation
• Eocene - Oligocene
• Contemporaneous heterotopic facies (Partly): Kichiyasu Sandstone, Mudstone and Conglomerate Member

• Sedimentary facies: Lacustrine
• Lithofacies: Sandstone, Mudstone
• Lithofacies (Minor): Lignite

• Thickness: 0 - 25 m
• Upper limit: bottom of the Conglomerate bed
• Upper limit: Conformity (Hosokawa Formation)
• Lower limit: Transitional (Kichiyasu Sandstone, Mudstone and Conglomerate Member)

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

• Distribution: Harasaka - Higashinaka, Hosokawa town, Miki city, Hyogo pref.; Otani, Tojo, Kato city, Hyogo pref.
• Tephra: Ishigamiyama 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.)