BIOSTRATIGRAPHY OF THE FRASNIAN STAGE BY RADIOLARIAN EVIDENCE

Abstract

Revising Frasnian radiolarians, we established three new radiolarian zones within this stage. These are the Helenifore gogoense-Retisphaera concinna Zone of the lower Frasnian, Moskovistella allbororum-Ceratoikiscum ukhtensis Zone of the middle Frasnian. and Bientactinosphaera egindyensis-Polyentactinia cumretia Zone of the upper Frasnian.