Name of Stratigraphic unit and correlation with Stage Slices:

Yaptiknyrd
Katian
Hirnantian
2


Name refers to the following Stratigraphic units:



Opinion Reference

Beznova et al.
2011
The Ordovician–Silurian boundary on the western slope of the subpolar Urals


Opinion is based on (if other than Time Slice):