West Oshima accretionary Gr
Period:
Jurassic, Triassic, Permian, Carboniferous
Age Interval:
Province:
Hokkaido
Type Locality and Naming
West Oshima Belt
Synonym:
Lithology and Thickness
The accretionary complexes consist of terrigenous clastic rocks (mainly sandstone and mudstone) and pelagic chert, with lesser amounts of limestone and basalt. They occur as structurally stacked thrust sheets of chert-clastic sequences or melange facies (Kawamura et al. 1986, 2000).
According to Kavamura et al. (2000), the Oshima Belt can be sub-divided into a western region where Carboniferous-Permian limestone and chert occur, and an eastern region where Palaeozoic outcrop is lacking, and Triassic Limestone characteristically occurs.
According to Kavamura et al. (2000), the Oshima Belt can be sub-divided into a western region where Carboniferous-Permian limestone and chert occur, and an eastern region where Palaeozoic outcrop is lacking, and Triassic Limestone characteristically occurs.
Lithology Pattern:
Relationships and Distribution
Lower contact
No data.
Upper contact
West Oshima Plutons Fm (unconformable)
Regional extent
West Oshima Belt
GeoJSON
null
Fossils
Age
Age Span:
Beginning stage:
Bajocian
Fraction up in beginning stage:
0
Beginning date (Ma):
170.90
Ending stage:
Oxfordian
Fraction up in the ending stage:
0
Ending date (Ma):
161.53
Depositional setting
Depositional pattern:
Additional Information
Compiler:
Hayato Ueda. 2g Hokkaido. in Moreno, T., WALLIS, S., Kojima, T. & Gibbons, W. (Eds) 2016. The Geology of Japan. Geological Society. London. 201-220.