| original |
Roadian |
Wordian |
Canada(Arctic) |
Utting,J. Palynostratigraphy of Permian and Lower Triassic Rocks, Sverdrup Basin, Canadian Arctic Archipelago |
1994 |
| details |
Ufimian |
Kazanian |
USSR(Udmurt ASSR) |
Utting,J. et al. Late Permian palynomorph assemblages from Ufimian and Kazanian sequences in Russia, and comparison with Roadian and Wordian assemblages from the Canadian Arctic |
1997 |
| details |
Roadian |
Wordian |
Canada(Arctic) |
Utting,J. et al. Late Permian palynomorph assemblages from Ufimian and Kazanian sequences in Russia, and comparison with Roadian and Wordian assemblages from the Canadian Arctic |
1997 |
| details |
Roadian |
Ufimian |
Barents Sea |
Grigoriev,M. et al. Sedimentology, palynostratigraphy, palynofacies and thermal maturity of Upper Permian rocks of Kolguyev Island, Barents Sea Russia |
1998 |
| details |
Late Tatarian |
|
Russia(Kirov) |
Afonin,S.A. Ultrastructure of the Permian Vittatina Group pollen grains |
1999 |