Nishikurosawa Fm
Period:
Neogene
Age Interval:
early-middle Miocene
Province:
Shimanto Belt
Type Locality and Naming
Synonym: Green Tuff
Lithology and Thickness
The pre-rifting deposits are overlain by altered volcanic and volcaniclastic rocks called the 'Green Tuff (Nishikurosawa Fm), which formed by active volcanism that occurred at the early stage of the opening of the Japan Sea.
Lithology Pattern:
Volcanic_ash
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Miyara Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Onnagawa Fm
Regional extent
GeoJSON
null
Fossils
Age
Age Span:
Beginning stage:
Langhian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
15.99
Ending stage:
Langhian
Fraction up in the ending stage:
1.0
Ending date (Ma):
13.82
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.