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Muro Group (Suzuki, 1939) Kishu Shimanto Research Group, 1977

Invalid synonym: Kinan Group

• Accretionary complex
• middle - late Eocene
• Correlation: Mikura Group
• Intruded by: Pyroclastic rock dike

• Sedimentary facies: Marine
• Lithofacies: Mudstone, Sandstone, Conglomerate

• Northern limit: Hongu - Minachi fault
• Thickness: 7,500 - 9,000 m
• Thickness (North): 5,000 - 6,000 m
• Thickness (South): 5,500 - 8,500 m
• Upper limit: Unconformity (Shimosato Sandstone and Mudstone, Tanabe Group)

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

• Distribution: Wakayama pref.
• Fossils (Shellfishes): Lucinoma sp., Nuculana sp., Portlandia sp.
• Fossils (Foraminifera): Cyclammina cancellata obsessa, Cyclammina formosensis, Cyclammina cf. pacifica, Cyclammina pusilla
• Fossils (Trace fossils): Helminthoidea isp., Megagrapton isp., Nereites cf. tosaensis, Spriorhaphe isp., Terebellina shikokuensis, Tosahelminthes? isp., Tosalorbis isp., Zonarites isp.

• Bessho and Nakaya (2011) Jour. Geol. Soc. Japan, vol.117, no.8, pp.423-438 DOI
• Tokuoka et al (1981) Geology of the Ryujin District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 6p.)
• Tateishi et al. (1979) Geology of the Esumi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 65p. (in Japanese with English abstract 6p.)
• Suzuki et al (1979) Geology of the Kurisugawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 5p.)
• Mizuno and Imai (1964) Tanami, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 61p. (in Japanese with English abstract 4p.)
• Mizuno (1957) Nachi, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 37p. (in Japanese with English abstract 3p.)
• Murayama (1954) Shingu, Atawa, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 27p. (in Japanese with English abstract 6p.)