Umegatani Group

[ Top ] [ Japanese ]

Umegatani Formation Hirayama et al., 1956

Type locality: Umegatani, Naga city, Naga county, Tokushima prefecture
Coherent formation
Late Triassic, Norian
Correlation: Kubotani Formation

Sedimentary facies: Shallow marine
Lithofacies: Mudstone, Muddy sandstone, Interbedded sandstone and mudstone
Lithofacies (Minor): Conglomerate

Thickness: ca. 100 m

Kochigatani Group
[ Upper ]
~~~~~~~~~~~~~~
Umegatani Formation
?--?--?--?--?-
Sabudani Formation
?--?--?--?--?-
Usugatani Formation
/--/--/--/--/-
[ Lower ]

Kurosegawa Belt (Sakashu, Tokushima pref.)
[ Upper ]
/--/--/--/--/-
Sakashu Group
~~~~~~~~~~~~~~
Kochigatani Group
/--/--/--/--/-
Haigyu Group
/--/--/--/--/-
Mitaki Igneous Rocks
/--/--/--/--/-
Miyagadani Metamorphic Rocks
/--/--/--/--/-
[ Lower ]

Chichibu Belt
[ Upper ]
/--/--/--/--/-
Kurosegawa Belt
/--/--/--/--/-
Northern Chichibu Belt
/--/--/--/--/-
Southern Chichibu Belt
/--/--/--/--/-
[ Lower ]

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

Distribution: Umegatani - Mount Tenkaizan - Sakashu - Shimoyochi - Higashisemitani, Naka city, Naka county, Tokushima pref.
Fossils (Shellfishes): Cardinia misawensis, Gervillia? sp., Monotis ochotica densistriata, Monotis ochotica ochotica, Monotis subcircularis, Monotis zabaikalica, Trigonodus? sp.

Hara et al. (2014) Geology of the Kitagawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 72p. (in Japanese with English abstract 4p.)