North Okhotsk sedimentary basin 

(Cenozoic) 

(Sea of Okhotsk, unit Czs)

Consists chiefly of Cenozoic sedimentary rocks up to 9,000 m thick that fill a series of troughs separated 
by transverse and longitudinal uplifts. Basin defined mainly by seismic data and one well. Volcanogenic 
and sedimentary rocks at base of basin may be Late Cretaceous. Sedimentary rocks chiefly represented by 
shale and lesser sandstone and siliceous sedimentary rocks. Lower horizons of the sedimentary cover are 
deformed by faults. Basin interpreted to have formed from collision of Okhotomorsk collage with 
subduction-zone margin of Asian continent in the Late Cretaceous and Paleogene. REFERENCES: 
Baboshina and others, 1984, 1985; Kulikov and others, 1988.