| original |
Algonkian |
|
Idaho |
Pflug,H.D. Some remains of lower plants from the Algonkian. |
1966 |
| original |
Algonkian |
|
Montana |
Pflug,H.D. Some remains of lower plants from the Algonkian. |
1966 |
| details |
Precambriam |
|
Montana |
Schopf,J.M. Precambrian microfossils. (In: Aspects of Palynology. R.H. Tschudy and R.A. Scott, editors) |
1969 |
| details |
Early Proterozoic |
|
Romania |
Visarion,A. et al. Determination of the age of a Crystalline Shales from the Apuseni Mountains, (Romania). |
1971 |
| details |
Early Proterozoic |
|
Romania |
Givulescu,R. The fossil flora of Roumania; Second Supplement, first Part. |
1973 |