| details |
Eocene |
|
Wyoming |
Penny,J.S. Late Cretaceous and Early Tertiary palynology. (In: Aspects of Palynology. R.H. Tschudy and R.A. Scott, editors) |
1969 |
| original |
Middle Eocene |
|
Utah |
Wodehouse,R.P. Tertiary pollen II. The oil shales of the Eocene Green River Formation |
1933 |
| details |
Early Tertiary |
|
Montana |
Rouse,G.E. Palynological dating and paleoreconstruction of three gold and silver orebodies in the western Cordillera of Canada, United States and Mexico. (In: Palynology of Ore Deposits. E.I. Robbins, editor) |
1990 |
| original |
Middle Eocene |
|
Colorado |
Wodehouse,R.P. Tertiary pollen II. The oil shales of the Eocene Green River Formation |
1933 |