Sorayama Fm
Period:
Permian
Age Interval:
Middle Permian (Roadian), (19b)
Province:
Hida Gaien Belt- Fukuji-Takayama area
Type Locality and Naming
Fukuji—Takayama area (b) is the type locality of this belt (Tsukada et al., 2004).
Synonym:
Lithology and Thickness
Mainly mafic volcanic rocks
[Figure 1: Stratigraphic relationship among the rocks of the Hida Gaien Belt (after M. Ehiro et al., 2016)]
[Figure 2: A columnar section of the Muribu and Fukuji successions showing their major lithologies and characteristic layers and blocks (after M. Ehiro et al., 2016)]
Lithology Pattern:
Volcanics
Relationships and Distribution
Lower contact
Conformably overlies the Mizuyagadani Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Fukujitype Gr
Regional extent
Hida Gaien Belt- Fukuji-Takayama area (b)
GeoJSON
null
Fossils
The Somyama Fm yields autochthonous Middle Permian fusulinoidean fauna (Tsukada et a1., 1999; Tsukada & Takahashi 2000)
Age
Shown as Middle Permian, hence placed Base of Roadian
Age Span:
Beginning stage:
Roadian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
274.37
Ending stage:
Capitanian
Fraction up in the ending stage:
1.0
Ending date (Ma):
259.55
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Moreno, T., WALLIS, S., Kojima, T. & Gibbons, W. (Eds) 2016. The Geology of Japan. Geological Society. London. 1-24.