| details |
Late Paleocene |
Early Eocene |
North Dakota |
Hickey,L.J. Stratigraphy and paleobotany of the Golden Valley Formation (Early Tertiary) of Western North Dakota. |
1977 |
| details |
Late Eocene |
|
New Mexico |
Leopold,E.B. et al. Development and affinites of Tertiary floras in the Rocky Mountains |
1972 |
| details |
Middle Eocene |
Early Oligocene |
Mississippi |
Frederiksen,N.O. Mid-Tertiary climate of southeastern Unites States: The sporomorph evidence. |
1980 |
| details |
Pliocene |
|
Mexico(Veracruz) |
Graham,A. Terrestrial Pliocene climates in northern Latin America |
1999 |
| details |
Early Miocene |
|
Mexico(Chiapas) |
Graham,A. Studies in Neotropical paleobotany. XIII: An Oligo-Miocene palynoflora from Simojovel, (Chiapas, Mexico). |
1999 |
| details |
Maastrichtian |
|
Canada(Saskatchewan) |
Jarzen,D.M. Some Maastrichtian palynomorphs and their phytogeographical and paleoecological implications. |
1978 |
| details |
Middle Eocene |
|
Alabama |
Crepet,W.L. Some aspects of the pollination biology of Middle Eocene angiosperms. |
1979 |
| details |
Middle Eocene |
Early Oligocene |
Alabama |
Frederiksen,N.O. Mid-Tertiary climate of southeastern Unites States: The sporomorph evidence. |
1980 |