Discovery of Early Carboniferous conodonts in Northern Kharaulakh Ranges (lower reaches of the Lena River, northeastern Siberia, Arctic Russia)

Lower Carboniferous type sections of the Upper Bastakh Member and lower Atyrdakh Formation in the lower reaches of the Lena River yielded an assemblage of conodonts comprising representatives of the genera Neopolygnathus, Bispathodus, Pseudopolygnathus, Mestognathus, Spathognathodus, a new genus and species Lenathodus bakharevi Izokh, nov. sp., and a new subspecies Neopolygnathus communis yazikovi Izokh nov. ssp. This assemblage suggests a correlation with the upper Tournaisian Gnathodus typicus-Siphonodella isosticha and Gnathodus pseudosemiglaber-Scaliognathus anchoralis zones thereby refining the Lower Carboniferous regional stratigraphy of Northern Kharaulakh and improving the reliability of inter-regional correlations.