Early asselian cyanobacteria and algae in the organogenic buildups of the section "Pisanyi kamen'" (Un'ya river, Northern Urals)

The paper presents the results of the study of the remains of cyanobacteria and calcareous algae of the Lower Permian organogenic buildups from the “Pisanyi Kamen'” section at the Un'ya River (Northern Urals). The microscopic study allowed extending taxonomic composition of Early Permian cyanobacteria and algae in the buildups: 3 genera of cyanobacteria, 12 genera of green algae, 2 genera of red algae and 4 genera of unclear systematic position were identified. It was revealed that representatives of green algae of the families Dasycladaceae and Cyclocrinaecae mainly participated in the formation of the first organogenic buildup, and algae of the Anchicodiaceae family participated in the second buildup. The established Asselian taxa of calcareous algae are cosmopolitan, therefore they may be important for the correlation of the Lower Permian West Ural sections.