Ryoseki Fm
Period:
Cretaceous
Age Interval:
Valanginian- Cenomanian, (15b)
Province:
Kurosegawa Belt- Shikoku
Type Locality and Naming
Kurosegawa Belt-western Shikoku
Synonym:
Lithology and Thickness
These shallow- to deep-marine facies include thick sequences of turbidites
Lithology Pattern:
Shallow-marine marl
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Kagio Fm
Upper contact
Regionally, the schematic strat column indicates this as the youngest unit
Regional extent
Kurosegawa Belt-western Shikoku: These are distributed from Kyushu to Kanto Mountains.
GeoJSON
null
Fossils
Age
The depositional ages range from Valanginian (140-133 Ma) to Cenomanian (100-94 Ma).
Age Span:
Beginning stage:
Valanginian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
137.70
Ending stage:
Cenomanian
Fraction up in the ending stage:
1.0
Ending date (Ma):
93.90
Depositional setting
shallow- to deep-marine
Depositional pattern:
Additional Information
Compiler:
Moreno, T., WALLIS, S., Kojima, T. & Gibbons, W. (Eds) 2016. The Geology of Japan. Geological Society. London. 1-24.