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Miura Group (Yabe, 1921) Eto et al., 1921

Synonym: Toyooka Subgroup

There are opinions to include Awa Group and Minamiboso Group in Boso peninsula, Chiba pref.

• Coherent formation
• late Miocene - late Pliocene
• Correlation (North): Awa Group
• Correlation (South): Minamiboso Group

• Sedimentary facies: Marine, Hemipelagic
• Sedimentary facies (North): Fore-arc basin deposit
• Sedimentary facies (South): Landward slope of trench deposit
• Lithofacies (Main): Mudstone
• Lithofacies (Minor): Basaltic scoria

• Upper limit: Unconformity (Miyata Formation, Yokosuka Formation, Misaki Sand and Gravel Deposits)
• Lower limit (Miura peninsula): Tagoegawa Unconformity (Kinugasa Formation, Tateishi Tuff Member, Koyabe Tuffaceous Sandstone and Mudstone Member)

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

• Distribution: Sajima, Yokosuka city, Kanagawa pref.

• Mori and Ogawa (2019) Jour. Geol. Soc. Japan, vol.125, no.10, pp.737-757 DOI
• Takahashi et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.8, pp.375-395, DOI
• Eto et al. (1998) Geology of the Yokosuka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 128p. (in Japanese with English abstract 3p.)
• Suzuki et al. (1990) Geology of the Nago District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 48p. (in Japanese with English abstract 3p.)
• Kodama et al. (1980) Geology of the Misaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 38p. (in Japanese with English abstract 3p.)