| details |
Late Miocene |
|
USSR(WSL) |
Dorofeev,P.I. Fossil flora from the Bol'Shaya Yuksa River in Western Siberia. |
1955 |
| details |
Late Neogene |
|
USSR(Vologda) |
Dorofeev,P.I. The Pliocene flora of the Clay at Nagavskaya on the Don |
1957 |
| details |
Miocene |
Middle Pliocene |
Canada(British Columbia) |
Hills,L.V. et al. Azolla primaeva and its phylogenetic significance. |
1967 |
| details |
Miocene |
Late Neogene |
USSR |
Friis,E.M. EM: Studies on Salviniaceae megaspores from the Middle Miocene Fasterholt Flora, Denmark. |
1977 |
| details |
Miocene |
Late Neogene |
Poland |
Friis,E.M. EM: Studies on Salviniaceae megaspores from the Middle Miocene Fasterholt Flora, Denmark. |
1977 |
| details |
Pliocene |
|
USSR(Voronezh) |
Dorofeyev,P.I. On the taxonomy of the Tertiary Azolla Lam. of the section Rhizosperma Meyen |
1980 |
| details |
Nd |
|
Poland |
Ziembinska-Tworzydlo,M. et al. A palynological subdivision of the Neogene in Western Poland. |
1981 |
| details |
Late Oligocene |
Miocene |
Poland |
Ziembinska-Tworzydlo,M. et al. A palynological subdivision of the Neogene in Western Poland |
1981 |
| details |
Chattian |
Piacenzian |
Worldwide |
Kovach,W.L. et al. Worldwide stratigraphic occurrences of Mesozoic and Tertiary megaspores. |
1989 |
| details |
Sarmatian |
|
USSR(Siberia) |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |