| original |
Late Cretaceous |
|
Montana |
Bergad,R.D. et al. A critical study of three Cretaceous Salviniaceous megaspores. |
1971 |
| original |
Late Cretaceous |
|
Montana |
Hall,J.W. et al. A critical study of three Cretaceous Salviniaceous Magaspores |
1971 |
| details |
Late Cretaceous |
Recent |
Nd |
Bergad,R.D. An ultrastructural comparison of walls of living and fossil Salviniaceous and Marsileaceous megaspores |
1972 |
| details |
Nd |
|
Nd |
Bergad,R.D. Ultrastructure of living and fossil Salviniaceous megaspores. |
1974 |
| details |
Late Maastrichtian |
Early 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 |
Maastrichtian |
|
North Dakota |
Bergad,R.D. Palynology of the Hell Creek Formation (Maastrichtian) in South-Central North Dakota. |
1974 |
| details |
Late Cretaceous |
|
Montana |
Sweet,A.R. et al. A detailed study of the genus Azollopsis. |
1974 |
| details |
Maastrichtian |
|
Montana |
Srivastava,S.K. Cretaceous spore-pollen floras |
1978 |
| details |
Nd |
|
Nd |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |