| details |
Early Pliocene |
Quaternary |
California |
Ballog,R.A. et al. Neogene palynology from the Southern California Continental Borderland, Site 467, Deep Sea Drilling Project Leg 63. |
1981 |
| details |
Early Pliocene |
Quaternary |
Mexico(Baja California) |
Ballog,R.A. et al. Neogene palynology from the Southern California Continental Borderland, Site 467, Deep Sea Drilling Project Leg 63. |
1981 |
| details |
Late Pliocene |
Early Pleistocene |
Idaho |
Leopold,E.B. et al. Pollen profiles of the Plio - Pleistocene transition in the Snake River Plain, Idaho. (In: Late Cenozoic history of the Pacific Northwest, interdisciplinary studies on the Clarkia fossil beds of Northern Idaho. C.J.Smiley, editor) |
1985 |
| details |
Eocene |
|
Wyoming |
Santucci,V.L. The Yellowstone Paleontological Survey. |
1998 |