Masuzawa Formation

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Masuzawa Formation Murai, 1960

Invalid synonym: Upper Yumoto Formaiton, Upper Yuguchi Formation

Type locality: Masuzawa, Shizukuishi city, Iwate county, Iwate prefecture
Coherent formation
Miocene

Lithofacies: Interbedded siltstone, tuff and conglomerate
Lithofacies (Basal): Conglomerate

Thickness: ca. 50 - 300 m
Upper limit: Unconformity (Kurasawayama Welded Tuff)
Lower limit: Unconformity (Yamatsuda Formation)

Shizukuishi, Iwate pref.
[ Upper ]
~~~~~~~~~~~~~~
Kakkondagawa Pyroclastic Rocks
~~~~~~~~~~~~~~
Minamishirasawa Formation / Masuzawa Formation
~~~~~~~~~~~~~~
Yamatsuda Formation
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Koshitomaezawa Formation
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Ryukawa Formation
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Kunimitoge Formation
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Obonai Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: Masuzawa - Hashiba - Azumaisawa, Shizukuishi city, Iwate county, Iwate pref.
Fossils: Wood fragments

Nakaya et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.7, pp.457-473 DOI
Suto and Ishii (1987) Geology of the Shizukuishi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 142p. (in Japanese with English abstract 5p.)