Minamiboso Group

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Minamiboso Group Kawakami and Shishikura, 2006

There are opinions to define as a part of Miura Group.

Invalid synonym: Nanso Group

Type locality: Minamiboso city, Chiba prefecture
Coherent formation
Landward slope basin of trench
middle Miocene - early Pliocene
Correlation: southern Miura Group

Sedimentary facies: Marine
Sedimentary facies: Landward slope of trench deposit

Thickness: 300 m or thicker
Upper limit: Unconformity (Oi Formation, Hongo Formation), Abut unconformity (Ikenouchi Formation, Sagashi Formation)
Lower limit: Unconformity (Hota Group)

Minamiboso Group
[ Upper ]
~~~~~~~~~~~~~~
Kagamigaura Formation
--------------
Hedate Formation
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Koura Formation
--------------
Kohama Formation
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Haraoka Formation
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Ishido Formation
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Azuma Formation
--------------
Iwaibukuro Formation
~~~~~~~~~~~~~~
[ Lower ]

Mineoka Belt (Boso peninsula)
[ Upper ]
~~~~~~~~~~~~~~
Awa Group / Minamiboso Group
~~~~~~~~~~~~~~
Hota Group
::::::::::::::
Mineoka Group
?--?--?--?--?-
[ Lower ]

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

Distribution: Minamiboso city, Chiba pref.

Utagawa et al. (2017) Jour. Geol. Soc. Japan, vol.123, no.11, pp.969-976 DOI
Kawakami and Shishikura (2006) Geology of the Tateyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 82p. (in Japanese with English abstract 5p.)