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Goryo Formation

• Coherent formation
• Late Cretaceous, Coniacian
• Contemporaneous heterotopic facies: Matsubara Formation

• Sedimentary facies: Shallow marine
• Lithofacies (Upper): Sandstone
• Lithofacies (Upper, Minor): Shale
• Lithofacies (Middle): Sandstone (Glauconite), Shale
• Lithofacies (Middle, Minor): Conglomerate, Coal
• Lithofacies (Lower): Conglomerate, Sandstone
• Lithofacies (Lower, Minor): Interbedded sandstone and shale
• Sedimentary structures: Graded bedding

• Thickness: ca. 400 m
• Thickness (Upper): ca. 100 m
• Thickness (Middle): ca. 100 - 150 m
• Thickness (Lower): ca. 40 m
• Upper limit: Conformity (Futakawa Formation)
• Lower limit: Conformity (Kanaya Formation), Unconformity (Kurosegawa Belt)

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

• Distribution: western Aridagawa city, Arida county, Wakayama pref.

• Fossils: Sharks (Teeth), Echinoids, Soliary corals
• Fossils (Ammonoids): Gauthiericeras? sp., Neohylloceras? sp., Polyptychoceras cf. obstrictum
• Fossils (Shellfishes): Acila sp., Grammatodon sachalinensis, Inoceramus (Sergipia) akamatsui, Inoceramus uwajimensis, Pecten (Propeamusium) cooperi var. yubarensis

• Yao (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.90-106 DOI
• 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.)