Taxonomic problems of some zonal species of the genus Palmatolepis and the correlation of the Frasnian of the East European Platform with conodont zonations

Most of the Frasnian regional stages Ukhta region, South Timan, Russia, are composed basinal deposits, however, hassi and jamieae zones Standard Conodont Zonation cannot be easily recognised in this region. A revision previously elaborated succession Timan-Pechora associations revealed that correlation problems connected with taxonomic interpretation zonal species Palmatolepis . Analysis conodont collection Professor W. Ziegler from Rhenish Slate Mountains, Germany, especially interval encompassing Lower to Upper rhenana zones, has provided evidence lack validity Zone as a separate stratigraphic unit. This statement is based on composition absence P. near lower boundary zone stratotype other sections becoming more common upsection. The between III–XI, (Ziegler Sandberg 1990) (Klapper 1989; Klapper Kirchgasser 2016) suggested herein. Domanikian Regional Stage corresponds punctata– Late Zones 5–10. boundaries 8–9 need further specified Timan. elaborated.