Penzhina sedimentary basin 

(Albian and Late Cretaceous) 

(Central part of Russian Northeast, unit Ks)

Consists chiefly of Albian to Late Cretaceous sedimentary rocks that comprise a northeast-striking trough 
about 90 km wide and 500 km long. Basin contains up to 6,000 m of littoral-marine and nonmarine clastic 
rocks and coal. Clastic rocks consist chiefly of volcanic and polymictic sandstone, conglomerate, siltstone, 
argillite, and local tuff, with mollusks and plant fossils. Weakly deformed into locally large anticlines and 
synclines. The Penzhina basin occurs to east of Okhotsk-Chukotka volcanic-plutonic belt and is interpreted 
as a forearc basin for the belt. REFERENCES: Ivanov and Pokhialainen, 1973; Parfenov, 1984; Kovaleva, 
1985.