Palynological assemblage of the Synya formation (Middle Triassic) from outcrops at the Vertny river (Bol'shaya Synya depression, the Timan-Northern Urals region)

The results of a palynological study of terrigenous rocks exposed in the lower reaches of the Vertny River and correlated with the Syninskaya Formation of the Bolshesyninskaya Series of the Legend of the North Ural Sheet Series GK-200/2 are presented. The Middle Triassic (Ladinian) age of the rocks was determined. A quantitative analysis of the species composition of the identified palynological assemblage using the Sporomorph EcoGroup method (SEG-analysis) was carried out. Based on palynological data, elements of the vegetation cover and landscape conditions have been reconstructed. It is concluded that the studied deposits were formed in the Ladinian Age in a very warm, humid climate within a vast tidal paleodelta. In the formation of the terrestrial vegetation cover, the leading role was played by moisture-loving plants characteristic of coastal marshes, deltaic lowlands, and tidal flats with mangrove-like thickets.