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Upper Sorachi Gr
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Upper Sorachi Gr base reconstruction

Upper Sorachi Gr


Period: 
Cretaceous

Age Interval: 


Province: 
Hokkaido

Type Locality and Naming

Sorachi-Yezo Belt (Yezo Main Zone)

Synonym:


Lithology and Thickness

The upper Sorachi Group is characterized by siliceous and volcanogenic sedimentary rocks such as chert, siliceous mudstone, felsic tuff and volcanic sandstone and conglomerate, with occasionally intercalated basaltic pillow lavas, dolerite sills (Kito 1987; Niida 1992), felsic tuff breccia and quartz diorite dykes (Girard et al. 1991).


Lithology Pattern: 
Volcanic_ash


Relationships and Distribution

Lower contact

Lower Sorachi Gr (conformable)

Upper contact

Lower Yezo Gr (conformable)

Regional extent

Sorachi-Yezo Belt (Yezo Main Zone)


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[142.15,45.33],[142.12,45.09],[142.12,44.99],[142.13,44.84],[142.17,44.71],[142.16,44.54],[142.15,44.39],[142.11,44.29],[142.11,44.06],[142.08,43.88],[142.16,43.67],[142.33,43.47],[142.32,43.41],[142.28,43.33],[142.22,43.18],[142.18,43.08],[142.21,43.01],[142.28,43.01],[142.22,42.94],[142.27,42.82],[142.43,42.74],[142.42,42.61],[142.5,42.42],[142.43,42.31],[142.25,42.39],[141.99,42.53],[141.95,42.7],[141.87,42.97],[141.82,43.23],[141.86,43.42],[141.87,43.6],[141.78,43.84],[141.74,44.03],[141.72,44.34],[141.63,44.81],[141.54,45.28],[141.53,45.45],[141.65,45.47],[141.69,45.44],[141.76,45.41],[141.83,45.44],[141.95,45.53],[142.08,45.39],[142.15,45.33]]]]}}

Fossils

Siliceous sedimentary rocks yield Late Jurassic-middle Early Cretaceous radiolarians (e.g., Kanie et al. 1981; Kiminami et al. 1985a, b; Kito 1987, 1995, 1997; Takashima et al. 2001).


Age 


Age Span: 

    Beginning stage: 
Berriasian

    Fraction up in beginning stage: 
0

    Beginning date (Ma): 
143.10

    Ending stage: 
Barremian

    Fraction up in the ending stage: 
0

    Ending date (Ma):  
126.50

Depositional setting

Lavas and volcanic rock clasts of the upper Sorachi Group show chemical characteristics of an arc setting (Girard et al. 1991; Niida 1992; Takashima et al. 2002).


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.