Yorii Welded Tuff

[ Top ] [ Japanese ]

Yorii Welde Tuff Watabe et al., 1950

Synonym: Yorii Acidic Rocks, Yorii Quartz Porphyry

Type locality: Arakawa river, Shoki bridge, Yorii city, Osato county, Saitama prefecture
Middle - Late Paleocene (59.6 Ma, FT; 58.0 Ma, K-Ar)
Correlation: Kotsutateyama Tuff, Nohi Rhyolites, Okunikko Rhyolites

Lithofacies: Rhyolitic welded tuff
Lithofacies (Minor): Granite porphyry, Andesite

Atokura Nappe (Saitama pref.)
[ Upper ]
/--/--/--/--/-
Yorii Welded Tuff, Paleocene
/--/--/--/--/-
Yorii Formation, Late Cretaceous - Paleocene
/--/--/--/--/-
Atokura Formation, Late Cretaceous
/--/--/--/--/-
Kinshozan Quartz Diorite, Permian
/--/--/--/--/-
[ Lower ]

Atokura Nappe (Gunma pref.)
[ Upper ]
/--/--/--/--/-
Kotsutateyama Tuff, Paleocene
/--/--/--/--/-
Atokura Formation, Late Cretaceous
/--/--/--/--/-
Yotsumatayama Quartz Diorite, Early Cretaceous
/--/--/--/--/-
Kawaiyama Quartz Diorite, Permian
/--/--/--/--/-
[ Lower ]

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

Distribution: Shoki bridge - Yatsu - Murei, Yorii city, Osato county, Saitama pref.

Takagi et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.7, pp.305-324, DOI
Makimoto and Takeuchi (1992) Geology of the Yorii District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 6p.)