Uchinohara Fm
Period:
Jurassic
Age Interval:
Early Jurassic (Hettangian), (8f, 8g)
Province:
South Kitakami Belt-Western Sub-belt
Type Locality and Naming
Shizugawa (Shizukawa)-Hashiura Sub-belt; Mizunuma area, Hashiura area
Synonym:
Lithology and Thickness
It consists mainly of massive arkose and lacks age-diagnostic fossils
Lithology Pattern:
Sandstone
Relationships and Distribution
Lower contact
Unconformably overlying the Isatomae Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Saragai Gr
Regional extent
Shizugawa (Shizukawa)-Hashiura Sub-belt; Mizunuma area, Hashiura area
GeoJSON
null
Fossils
Age
Some authors (e.g., Takizawa et a1. 1984, 1990) have treated this formation as of Early Jurassic age, hence used the same in this Lexicon
Age Span:
Beginning stage:
Hettangian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
201.36
Ending stage:
Aalenian
Fraction up in the ending stage:
1.0
Ending date (Ma):
170.90
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.