| details |
Middle Miocene |
Pleistocene |
Alaska |
White,J.M. et al. An 18 million year record of vegetation and climate change in northwestern Canada and Alaska: Tectonic and global climatic correlates. |
1997 |
| details |
Middle Eocene |
Early Oligocene |
Alabama |
Frederiksen,N.O. Mid-Tertiary climate of southeastern Unites States: The sporomorph evidence. |
1980 |
| details |
Claiborne |
|
Alabama |
Gray,J. Temperate pollen genera in the Eocene, (Claiborne), flora, Alabama. |
1960 |
| details |
Eocene |
|
Alabama |
Graham,A. Origin and evolution of the biota of southeastern North America. |
1964 |
| details |
Oligocene |
Recent |
Alabama |
Graham,A. The Tertiary history of the northern temperate element in the northern Latin America biota. |
1999 |