| details |
Sarmatian |
|
USSR(Rostov) |
Dorofeev,P.I. Paleocarpological investigations of the Tertiary flora of Kazakhstan |
1955 |
| details |
Miocene |
|
USSR(Caucasus) |
Dorofeev,P.I. Paleocarpological investigations of the Tertiary flora of Kazakhstan |
1955 |
| details |
Sarmatian |
|
USSR(Ukrainian SSR) |
Dorofeev,P.I. Paleocarpological investigations of the Tertiary flora of Kazakhstan |
1955 |
| details |
Middle Oligocene |
Late Miocene |
Canada(British Columbia) |
Hills,L.V. et al. Azolla primaeva and its phylogenetic significance. |
1967 |
| details |
Late Oligocene |
Late Miocene |
Nd |
Fowler,K. Megaspores and Massulae of Azolla prisca from the Oligocene of the Isle of Wight. |
1975 |
| details |
Middle Miocene |
|
Denmark |
Friis,E.M. EM: Studies on Salviniaceae megaspores from the Middle Miocene Fasterholt Flora, Denmark. |
1977 |
| details |
Late Oligocene |
Miocene |
Nd |
Collinson,M.E. A new multiple-floated Azolla from the Eocene of Britian with a brief review of the genus. |
1980 |
| details |
Sarmatian |
|
USSR(Ukrainian SSR) |
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 |
Late Tongrian |
|
Belgium |
Vanhoorne,R.E. Morphology and stratigraphical position of the megaspores of three species of Azolla, occurring in Belgian Cainozoic deposits |
1984 |
| details |
Tertiary |
|
Czechoslovakia |
Knobloch,E. Megaspores of fossil Pterodphyta |
1986 |
| details |
Bartonian |
Early Piacenzian |
Worldwide |
Kovach,W.L. et al. Worldwide stratigraphic occurrences of Mesozoic and Tertiary megaspores. |
1989 |
| details |
Late Miocene |
|
USSR(Ukrainian SSR) |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |
| details |
Weichselian |
|
Belgium |
Kedves,M. Tranmission Electron Microscopy of the Fossil Spores. |
1996 |