| original |
Maastrichtian |
|
Montana |
Hall,J.W. A new genus of Salviniaceae and a new species of Azolla from the Late Cretaceous. |
1968 |
| details |
Eocene |
|
North Dakota |
Jain,R.K. et al. A contribution to the Early Tertiary fossil record of the Salviniaceae |
1969 |
| details |
Late Cretaceous |
|
Montana |
Hall,J.W. Studies on fossil Azolla |
1969 |
| details |
Late Cretaceous |
|
Montana |
Hall,F.W. Notes on fossil Salviniaceae. |
1969 |
| details |
Late Cretaceous |
|
Canada(Alberta) |
Jain,R.K. Pre-Tertiary records of Salviniaceae. |
1971 |
| details |
Nd |
|
Nd |
Bergad,R.D. Ultrastructure of living and fossil Salviniaceous megaspores. |
1974 |
| details |
Maastrichtian |
Paleocene |
Canada(Alberta) |
Sweet,A.R. et al. A detailed study of the genus Azollopsis. |
1974 |
| details |
|
|
Montana |
Hall,J.W. Cretaceous Salviniaceae. |
1974 |
| details |
|
|
North Dakota |
Hall,J.W. Cretaceous Salviniaceae. |
1974 |
| details |
Maastrichtian |
|
North Dakota |
Bergad,R.D. Palynology of the Hell Creek Formation (Maastrichtian) in South-Central North Dakota. |
1974 |
| details |
Maastrichtian |
|
Montana |
Srivastava,S.K. Cretaceous spore-pollen floras |
1978 |
| details |
Late Maastrichtian |
|
USA(Rocky Mountains) |
Nichols,D.J. et al. Cretaceous palynomorph biozones for the Central and northern Rocky Mountain Region of the United States. |
1982 |
| details |
Maastrichtian |
Priabonian |
Worldwide |
Kovach,W.L. et al. Worldwide stratigraphic occurrences of Mesozoic and Tertiary megaspores. |
1989 |
| details |
Maastrichtian |
|
Montana |
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 |