| original |
Middle Campanian |
Middle Maastrichtian |
Canada(Alberta) |
Campbell,J.D. et al. Two new megaspore species from the Continental Upper Cretaceous (Campanian-Maestrichtian) of the Alberta Plains. |
1972 |
| details |
Maastrichtian |
|
North Dakota |
Bergad,R.D. Palynology of the Hell Creek Formation (Maastrichtian) in South-Central North Dakota. |
1974 |
| details |
Campanian |
Maastrichtian |
Worldwide |
Kovach,W.L. et al. Worldwide stratigraphic occurrences of Mesozoic and Tertiary megaspores. |
1989 |
| details |
Middle Campanian |
Middle Maastrichtian |
Canada(Alberta) |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |
| details |
Santonian |
|
Georgia |
Lupia,R. et al. Marsileaceae sporocarps and spores from the Late Cretaceous of Georgia |
2000 |