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Matsubara Formation

• Type locality: Matsubara - Kamimatsubara, Aridagawa city, Arida county, Wakayama prefecture
• Coherent formation
• Late Cretaceous, Coniacian
• Contemporaneous heterotopic facies: Goryo Formation

• Sedimentary facies: Shallow marine
• Lithofacies: Sandstone
• Lithofacies (Minor): Conglomerate, Shale, Felsic tuff
• Lithofacies (Basal): Conglomerate

• Thickness: ca. 250 m
• Thickness (Basal): 0 - 10 m or thicker
• Upper limit: Conformity (Futakawa Formation)
• Lower limit: Disconformity (Kamimatsubara Formation), Unconformity (Kurosegawa Belt)

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

• Distribution: Matsubara - Kamimatsubara, Aridagawa city, Arida county, Wakayama pref.
• Fossils: Echinoids
• Fossils (Ammonoids): Gaudryceras denseplicatum, Holcodiscoides? sp., Scaphites puerculus
• Fossils (Shellfishes): Inoceramus (Sergipia) akamatsui, Inoceramus cf. ezoensis, Inoceramus cf. uwajimensis, Lima sp.

• Yao (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.90-106 DOI
• Hirayama and Tanaka (1956) Todorogi, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 37p. (in Japanese with English abstract 11p.)
• Hirayama and Tanaka (1956) Kainan, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 62p. (in Japanese with English abstract 12p.)