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Yokobuna Mudstone Mizuno et al., 1987

• Type locality: Yokobuna, Omaezaki city, Shizuoka prefecture
• Coherent formation
• middle Miocene - Pliocene
• Contemporaneous heterotopic facies: lower Sagara Alternation
• Correlation: lower Oyori Mudstone
• Correlation (Lower): Susuki Mudstone

• Sedimentary facies: Marine
• Sedimentary facies: Forearc basin (Sagara-Kakegawa Basin) deposit
• Depth of water: lower part of Upper bathyal (200 - 600 m)
• Lithofacies: Mudstone
• Lithofacies (Minor): Sandstone

• Thickness: ca. 200 - 500 m
• Upper limit: Conformity (Sagara Alternation)
• Lower limit: Conformity (Sugegaya Alternation, Hirugaya Alternation)

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

• Distribution: Yokobuna, Omaezaki city, Shizuoka pref.; Dodoko - Ebie, Makinohara city, Shizuoka pref.
• Fossils: Sponges (Sagarites chitanii), Calcareous nannofossils
• Fossils (Foraminifera): Neogloboquadrina acostaensis
• Tephra: Ka

• Sugiyama et al. (1988) Geology of the Omaezaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 153p. (in Japanese with English abstract 6p.)