South Okhotsk sedimentary basin 

(Cenozoic) 

(Southern Sea of Okhotsk, unit Czs)

Consists chiefly of clastic sedimentary rocks ranging up to 4 km thick. Seismic investigations reveal two 
units: (1) a lower, 3-km-thick sequence of acoustically transparent rocks composed of shale and argillite; 
and (2) an upper, 1-km-thick sequence of coherently bedded turbidite deposits with tuffaceous layers of 
presumed late Miocene to Pliocene age. REFERENCES: Gnibidenko and Svarichevsky, 1984; Sergeev 
and Krasny, 1987.