| original |
Eocene |
|
North Dakota |
Jain,R.K. et al. A contribution to the Early Tertiary fossil record of the Salviniaceae |
1969 |
| details |
Eocene |
|
North Dakota |
Hall,F.W. Notes on fossil Salviniaceae. |
1969 |
| details |
|
|
North Dakota |
Hickey,L.J. Stratigraphy and paleobotany of the Golden Valley Formation (Early Tertiary) of Western North Dakota. |
1977 |
| details |
Ypresian |
Priabonian |
Worldwide |
Kovach,W.L. et al. Worldwide stratigraphic occurrences of Mesozoic and Tertiary megaspores. |
1989 |
| details |
Eocene |
|
North Dakota |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |