Upper subgroup Fm
Period:
Triassic
Age Interval:
Upper Triassic (Norian), (15a, 15b)
Province:
Kurosegawa Belt- Shikoku
Type Locality and Naming
Kurosegawa Belt-western Shikoku
Synonym:
Lithology and Thickness
composed mudstone and sandstone
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Lower subgroup Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Nakanose Fm
Regional extent
Kurosegawa Belt-western Shikoku
GeoJSON
null
Fossils
The upper subgroup contains the bivalve Monotis and ammunoid Sirenites (Tsujino et a1., 2013).
Age
Upper Triassic (Norian)
Age Span:
Beginning stage:
Norian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
227.30
Ending stage:
Norian
Fraction up in the ending stage:
1.0
Ending date (Ma):
205.74
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.