| details |
Nd |
|
Nd |
Staplin,F.L. et al. Relationships among Gymnospermous pollen. |
1967 |
| details |
Late Pliocene |
|
Idaho |
Leopold,E.B. et al. Development and affinites of Tertiary floras in the Rocky Mountains |
1972 |
| 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 |
Pliocene |
|
California |
Heusser,L.E. et al. Late Tertiary and Pleistocene vegetation history; 20my to 20ky. II. 1. North America. (In: Vegetation History. B.Huntley et al, editor) |
1988 |
| details |
Quaternary |
|
Wyoming |
Santucci,V.L. The Yellowstone Paleontological Survey. |
1998 |