2012) have shown different thicknesses and boundaries between the clayey-carbonate and terrigenous deposits
within the Volyn-Podillyan Plate.
Although simple, the two distinguished sections of the profile supported the distinction between terrigenous deposits
near the surface, and transitional to marine sediments at depth.
As stated above, it is assumed that the asymmetry in the distribution and thickness of the sedimentary facies, including limited amounts of terrigenous deposits
, was conditioned by the presence of an active structure in the Triassic basement.
On about 10% of the area bog deposits (mainly peat) cover the terrigenous deposits
. The debris in the tills is often represented by fragments of bedrock and crystalline basement, in which elevated concentrations of heavy metals occur, such as Dictyonema shale and phosphorite.
The two-carbonate successions of contrasting lithologies are separated by a unit of pure quartz sandstones up to 80 m thick (Baykit Sandstone), which is overlain by the fine-grained terrigenous deposits
of the Volginian and Kirensko-Kudrinian regional stages (Dronov et al.