Abstract
It is established that the boundary between the Kozhim (P1) and Kozhim Rudnik (P2) formations in the Kozhim River section is drawn inside a member, about 100 m thick, composed of six lithocycles of similar structure. They reveal a general upsection coarsening of clastic material and incorporate six to ten layers. Based on the analysis of repeating combinations of genetic parameters (granulometric composition, structures, taphocoenoses, and others), we have recognized and described seven units of complete ideal lithocycles in the studied section. Evidently, each cycle was produced by processes related to the accumulation and burial of deltaic fans. The geohistorical rank of the boundary between the Kozhim (P1) and Kozhim Rudnik (P2) formations is very low and does not fit any significant boundary of the evolution of depositional environment in paleobasin. The revealed surfaces of intraformational washouts and hiatuses, as well as the wide range of facies changes, which significantly controls the composition of organic remains, do not support the proposition to establish here the global stratotype point for the lower boundary of the Upper Permian.
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