Nagao Fm
Period:
Jurassic
Age Interval:
Middle Jurassic (Bajocian-Kimmeridgian), (8f)
Province:
South Kitakami Belt-Western Sub-belt
Type Locality and Naming
Shizugawa (Shizukawa)-Hashiura Sub-belt; Hashiura area
Synonym:
Lithology and Thickness
It comprises bedded mudstone with alternating beds of sandstone and mudstone
Lithology Pattern:
Clayey sandstone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Nakahara Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Tsukihama Fm
GeoJSON
null
Fossils
Age
Shown as Middle Jurassic-Early Cretaceous, hence placed 50% up in Bajocian
Age Span:
Beginning stage:
Bajocian
Fraction up in beginning stage:
0.5
Beginning date (Ma):
169.54
Ending stage:
Kimmeridgian
Fraction up in the ending stage:
1.0
Ending date (Ma):
149.24
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.