Sedimentation in the denudation zone on the boundary of the Middle and Upper Devonian in the Middle Timan

Discrete problematic lowthickness sedimentary beds are described. They were formed after the general tectonic uplifting of the territory at the deposition of the crumbling rocks of the Middle Devonian in the lowlands of the relief. As a result, they are developed very locally, often with cross bedding on the underlying rocks. As sedimentation occurred on land in the area of vegetation development and was long because material was carried in by meteoric waters, the sediments are abundant in coal. With the development of erosion processes, the terrain transformed: positive and negative forms of relief “wandered”. So, over time the formed bodies of the reworked material could be in the zone of denudation and collapse in turn, being the source of occurrence of layers and lenses in new depressions. This process was repeated again and again until the sea in Sargai time. As a result of successive replacement of the newly formed sedimentary bodies to Ust’Yarega transgression, the layers more close to Sargai time than to Timan remained in the majority. However, the beds belonging to any piece of the period of peneplanation and bearing relevant palynocomplexes could remain. The conclusion is drawn on their genetic isolation from the underlying and overlying deposits.