| details |
Middle Eocene |
|
California |
Penny,J.S. Late Cretaceous and Early Tertiary palynology. (In: Aspects of Palynology. R.H. Tschudy and R.A. Scott, editors) |
1969 |
| details |
Late Paleocene |
Early Eocene |
North Dakota |
Leopold,E.B. et al. Development and affinites of Tertiary floras in the Rocky Mountains |
1972 |
| 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 |
Early Miocene |
Middle Miocene |
Mexico(Chiapas) |
Graham,A. The Tertiary history of the northern temperate element in the northern Latin America biota. |
1999 |