| original |
Early Cambrian |
|
USSR |
Naumova,S.N. Spores of the Lower Cambrian |
1949 |
| details |
Precambriam |
Cambrian |
USSR(Siberia) |
Timofeev,B.V. Discovery of Cambrian and Precambrian spores in formations of eastern Siberia. |
1955 |
| details |
Precambriam |
Cambrian |
Nd |
Roselt,G. Palaobotanic and palaobotanical method and geological investigation. |
1972 |
| details |
Devonian |
|
USSR(Ukrainian SSR) |
Medvedeva,A.M. Palynological investigation of Petroleum |
1978 |
| details |
Early Cambrian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |