Saragai Gr
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
Upper Triassic rocks are represented by the Saragai Group which is limited to narrow outcrops within the Shizugawa-Hashiura and Ofunato sub-belts. The Upper Triassic SaIagai Group comprises the Uchinohara Formation (Hashiuraw-Mizunuma area; Takahashi
& Onuki 1959) in the Shizugawa-Hashiura Sub-belt.
Lithology Pattern:
Sandstone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Uchinohara Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Kojima Fm
Regional extent
Shizugawa (Shizukawa)-Hashiura Sub-belt; Mizunuma area, Hashiura area
GeoJSON
null
Fossils
Age
Shown as Early Jurassic, hence placed Base of Hettangian
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.