Yoshii Fm
Period:
Permian
Age Interval:
Roadian-Changhsingian, (27b)
Province:
Akiyoshi Belt
Type Locality and Naming
Akiyoshi Belt Chert subfacies
Synonym:
Lithology and Thickness
Sandstone-shale alteration
[Figure 1: Stratigraphy of the typical shelf facies and oceanic facies Paleozoic rocks in Japan. Modified after Minato et al., (1965), Mori et al. (1992), Kanmera et al. (1990) and Regional Geology Series of the Geological Society of Japan (Asakura Shoten) (after M. Ehiro et al., 2016)]
Lithology Pattern:
Sandy_claystone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Notabiyama Fm
Upper contact
The schematic strat column indicates this is the youngest unit.
Regional extent
Akiyoshi Belt Chert subfacies
GeoJSON
null
Fossils
Age
Shown as Lower-Upper Permian, hence placed Asselian-Changhsingian
Age Span:
Beginning stage:
Asselian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
298.89
Ending stage:
Changhsingian
Fraction up in the ending stage:
1.0
Ending date (Ma):
251.90
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.