Hashiura Gr
Period:
Jurassic
Age Interval:
Middle-Late Jurassic (Bajocian-Kimmeridgian), (8e)
Province:
South Kitakami Belt-Western Sub-belt
Type Locality and Naming
Shizugawa (Shizukawa)-Hashiura Sub-belt; Shizugawa area
Synonym:
Lithology and Thickness
The Middle Jurassic-Lower Cretaceous sequence in the Shizugawa-Hashiura Sub-belt comprises the Hashiura Gr and the overlying Jusanhama Gr. The Hashiura Gr in the Shizugawa area is in ascending order, divided into the Aratozaki, Arato and Sodenohama
formations.
Lithology Pattern:
Sandy_claystone
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Sodenohama Fm
Upper contact
Regionally, the schematic strat column indicates this is the youngest unit
Regional extent
Shizugawa (Shizukawa)-Hashiura Sub-belt; Shizugawa area
GeoJSON
null
Fossils
Age
Middle-Late Jurassic (Bajocian-Kimmeridgian)
Age Span:
Beginning stage:
Bajocian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
170.90
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.