Onnagawa Fm
Period:
Neogene
Age Interval:
middle-upper Miocene
Province:
Shimanto Belt
Type Locality and Naming
Synonym:
Lithology and Thickness
The metal deposits formed by this volcanism and associated hydrothermal activity are called ‘Kuroko', yielding copper, lead and zinc. Subsequent sedimentation is represented by thick marine siliciclastics; The lower part of 'Kuroko' is dominated by hard Shale. Subsequent sedimentation is represented by thick marine siliciclastics. This succession has been regarded as a 'standard succession', based on which a local chronostratigraphy was established (Hujioka 1959).
Lithology Pattern:
Claystone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Nishikurosawa Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Funakawa Fm
Regional extent
GeoJSON
null
Fossils
Age
middle-upper Miocene
Age Span:
Beginning stage:
Serravallian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
13.82
Ending stage:
Serravallian
Fraction up in the ending stage:
1.0
Ending date (Ma):
11.63
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.