The lowermost diverse Ediacaran assemblages from Canadian Mackenzie Mountains
correlate with the oldest fauna in Namibia, a rich Ediacaran site that contains
beds from the Neoproterozoic-Cambrian boundary.
Correlating and dating Ediacaran fossil sites has been difficult because the fossils are preserved in sandstone. To get the carbon isotope data, the rock has to be a carbonate.
Note the big change in Carbon isotope ratio coinciding with the Varanger
glaciation. Tillites, the sedimentary recored of glaciation appear on all
continents in the Neoproterozoic.
Figure from GSA Bulletin, October, 1994