| original |
Late Cretaceous |
|
Canada(Alberta) |
Jain,R.K. Pre-Tertiary records of Salviniaceae. |
1971 |
| details |
Paleocene |
|
Canada(Alberta) |
Sweet,A.R. et al. Vegetative remains of Azolla Schopfii Dijkstra from Genesee, Alberta. |
1973 |
| details |
Maastrichtian |
|
North Dakota |
Bergad,R.D. Palynology of the Hell Creek Formation (Maastrichtian) in South-Central North Dakota. |
1974 |
| details |
Cretaceous |
|
Nd |
Fowler,K. Megaspores and Massulae of Azolla prisca from the Oligocene of the Isle of Wight. |
1975 |
| details |
Nd |
|
Nd |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |
| details |
Cretaceous |
|
Nd |
Ramanujam,C.G.K. et al. Remain of Azollaceae from Late Albian of Cauvery Basin and their evolutionary significance. |
1996 |