Processing results from drill hole 21, Murmanskaya Area (Report 5634, Leningrad)

Within the studied geological section a detailed lithologic and stratigraphic sequence of sedimentary rocks (based on microfauna, palynology, and lithologic composition) from Middle Jurassic to Quaternary deposits has been carried out. 2. Thicknesses of the units are as followed: Middle Jurassic (Callovian?) - 40 m, Late Jurassic - 342 m (Oxfordian-Kimmeridgian - 260 m, Tithonian - 82 m), Early Cretaceous - 948 m (Valanginian - 25 m, Barremian-Aptian - 71 m, Aptian - 522 m, Albian - 330 m), Late Cretaceous - 65 m, Neogene-Quaternary - 75 m, Quaternary - 17 m. 3.

The section is mostly composed of clayey-silty sedimentary rocks formed in a marine basin. The main part of Mesozoic-Cenozoic deposits formed in a shallow marine basin. 4. Hiatuses in sedimentation during the pre-Cenozoic, the post-Valanginian and the post-Jurassic are assumed. 5.

Sharp change of sediment composition occurred in the pre-Cenozoic and the post-Jurassic. 6. In the Late Jurassic the crust of weathering existed in the source area. 7. Sedimentary rocks are weakly lithified (early epigenesis - beginning of late epigenesis). 8.

Composition of sedimentary rocks in the hole strongly differs from one of coeval deposits in the Kolguev Island and the Timan-Pechora region.