Yorii Formation

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Yorii Formation (Fujimoto and Watabe, 1947) Makimoto and Takeuchi, 1992

Invalid synonym: Yorii Conglomerate Formation, Kimochi Formation

Type locality: Fukazawa river, Yorii city, Osato county, Saitama prefecture
Coherent formation
Paleocene (65.4 Ma)

Sedimentary facies: Marine
Lithofacies: Conglomerate, Sandstone
Lithofacies (Minor): Lignite, Acidic tuff, Tuffaceous siltstone

Thickness: 400 m or thicker
Upper limit: Unconformity (Kozono Formation)

Yorii Formation
[ Yorii ]
?--?--?--?--?-
Main part
--------------
Hachigata Conglomerate Member
?--?--?--?--?-
[ Lower ]

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: Fukazawa river - Mikayama, Yorii city, Osato county, Saitama pref.; Ogawa city, Hiki county, Saitama pref.; Hirasawa, Ranzan city, Hiki county, Saitama pref.
Fossils: Sharks (Galeocerdo aduncus), Pollen

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.)