| original |
Pontian |
|
USSR(Ukrainian SSR) |
Negru,A.G. New Pliocene species of Salvinia from the Northwestern Coastal Region of the Black Sea. |
1978 |
| details |
Messinian |
Zanclian |
Worldwide |
Kovach,W.L. et al. Worldwide stratigraphic occurrences of Mesozoic and Tertiary megaspores. |
1989 |
| details |
Pontian |
|
USSR(Ukrainian SSR) |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |
| details |
Nd |
|
Nd |
Jain,R.K. et al. A contribution to the Early Tertiary fossil record of the Salviniaceae |
1969 |
| details |
Paleocene |
|
Nd |
Martin,A.R.H. Somestructures in Azolla megaspores, and an anomalous Form. |
1976 |