| details |
Paleocene |
|
Canada(Alberta) |
Sweet,A.R. et al. Early Tertiary species of Azolla, subg., Azolla sect., Kremastospora, from Western Arctic, Canada. |
1976 |
| original |
Paleocene |
|
Canada(Alberta) |
Snead,R.G. Microfloral diagnosis of the Cretaceous-Tertiary boundary, Central Alberta. |
1969 |
| details |
Cretaceous |
|
Nd |
Ramanujam,C.G.K. et al. Remain of Azollaceae from Late Albian of Cauvery Basin and their evolutionary significance. |
1996 |
| details |
Danian |
Thanetian |
Worldwide |
Kovach,W.L. et al. Worldwide stratigraphic occurrences of Mesozoic and Tertiary megaspores. |
1989 |
| details |
Paleocene |
|
Nd |
Fowler,K. Megaspores and Massulae of Azolla prisca from the Oligocene of the Isle of Wight. |
1975 |
| details |
Paleocene |
|
Nd |
Collinson,M.E. A new multiple-floated Azolla from the Eocene of Britian with a brief review of the genus. |
1980 |
| details |
Paleocene |
|
Canada(Alberta) |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |