| details |
Middle Eocene |
|
Colorado |
Bradley,W.H. Origin and microfossils of the oil shales of the Green River Formation of Colorado and Utah. |
1931 |
| details |
Middle Eocene |
|
Utah |
Bradley,W.H. Origin and microfossils of the oil shales of the Green River Formation of Colorado and Utah. |
1931 |
| details |
Algonkian |
|
Idaho |
Pflug,H.D. Some remains of lower plants from the Algonkian. |
1966 |
| details |
Algonkian |
|
Montana |
Pflug,H.D. Some remains of lower plants from the Algonkian. |
1966 |
| details |
Middle Miocene |
|
|
Mautino,L.R. New data on taxon and palaeopalynology from the San Jos© Formation (Middle Miocene), TucumЎn, Argentina. |
2003 |