Biostratigraphic characteristic of the middle-upper frasnian deposits of the Malaya Usa river (Polar Urals) on conodonts

Conodonts play an impotant role in the Upper Devonian biostratigraphy. Zonal sequence was marked and boundaries stage and substage units were accepted on the conodonts. Despite the fact that the results of the study of Frasnian deposits on the Malaya Usa River were presented in numerous geological reports and publications, there are no works on their detailed biostratigraphic subdivision. In the article we present new data on the taxonomic composition and stratigraphic distribution of the conodont complexes in the Middle-Upper Frasnian deposits on the Malaya Usa River. Biostratigraphic subdivision of the studied deposits (conodont zones hassi - Laterhenana) was conducted.