Keta Fm
Period:
Jurassic
Age Interval:
Early Jurassic (Sinemurian), (15a)
Province:
Kurosegawa Belt- Shikoku
Type Locality and Naming
Kurosegawa Belt-central Shikoku
Synonym:
Lithology and Thickness
It is divided into the lower (sandstones and conglomerates) and upper (mudstone) members.
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Naruo Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Ino Fm
Regional extent
Kurosegawa Belt-central Shikoku
GeoJSON
null
Fossils
Age
Early Jurassic (Sinemurian)
Age Span:
Beginning stage:
Sinemurian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
199.46
Ending stage:
Pliensbachian
Fraction up in the ending stage:
0.9
Ending date (Ma):
185.07
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.