New data on the Triassic Lestanshor formation (south western part of the Pay Khoy ridge)

New materials on the Triassic formations based on the results of geological mapping of the South Western part of the Pay Khoy Ridge are considered. The Triassic deposits of the marginal and intermountain troughs of the North Eastern side of the Korotaikha lithofacies belt of the Pay Khoy are represented by the Lestanshor Formation.A detailed study of the section of the Lestanshor Formation has been carried out; according to the results of lithological analysis of the boundary deposits, the relationship with the underlying Permian deposits (Pechora series) has been previously established. The appearance of coarse clastic material (pebbles and gravel) marks the base of the Lestanshor Formation in the Yuryakha River section.Based on the results of silicate analysis, the climatic conditions of the formation and the degree of maturity of the chemical composition of sandstones were reconstructed.Xenoxylon fossil wood from the Lower Triassic Middle Lestanshor Subformation is described. The wood of Xenoxylon is found in the Lower Triassic for the first time.