original |
Late Helikian |
Early Hadrynian |
Canada(NWT) |
Hofmann,H.J. et al. Precambrian biota from the Little Dal Group, MacKenzie Mountains, Northwestern Canada. |
1979 |
original |
Late Riphean |
Vendian |
Norway |
Vidal,G. et al. Planktonic, acid-resistant microfossils from the Upper Proterozoic strata of the Barents Sea Region of Varanger Peninsula, East Finnmark, northern Norway |
1983 |
original |
Late Proterozoic |
Early Cambrian |
Canada(Yukon) |
Hofmann,H.J. Organic-walled microfossils from the Latest Proterozoic and Earliest Cambrian of the Wernecke Mountains, Yukon. |
1984 |