Oshika Gr
Period:
Jurassic
Age Interval:
Early Jurassic (Bajocian-Tithonian), (8j)
Province:
South Kitakami Belt-Central Sub-belt
Type Locality and Naming
the Karakuwa-Oshika Sub-belt; Oshika Peninsula
Synonym:
Lithology and Thickness
The Oshika Gr comprises the Tsukinoura,Oginohama and Ayukawa formations in ascending order (Takizawa et a1., 1974).
Lithology Pattern:
Aus conglomerate
Relationships and Distribution
Lower contact
Regionally, the schematic strat column indicates the next older unit as Ayukawa Fm
Upper contact
Regionally, the schematic strat column indicates the next younger unit as Yamadori Fm
Regional extent
It is widely distributed across the Oshika Peninsula, belong to the Katakuwa-Oshika Sub-belt
GeoJSON
null
Fossils
Age
Early Jurassic (Bajocian-Tithonian)
Age Span:
Beginning stage:
Bajocian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
170.90
Ending stage:
Tithonian
Fraction up in the ending stage:
1.0
Ending date (Ma):
143.10
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.