| details |
Campanian |
|
Texas |
Baghai,N.L. Classification and analysis of palynomorphs of the Aguja Formation (Campanian), Big Bend National Park, Brewster County, Texas. |
1994 |
| details |
Middle Eocene |
|
Colorado |
Potonie,R. Synopsis of the genera of the sporae dispersae. Part 3 |
1960 |
| original |
Middle Eocene |
|
Colorado |
Wodehouse,R.P. Tertiary pollen II. The oil shales of the Eocene Green River Formation |
1933 |
| details |
Middle Eocene |
|
Utah |
Wodehouse,R.P. Tertiary pollen II. The oil shales of the Eocene Green River Formation |
1933 |