| original |
Vendian |
Cambrian |
W.Germany(Niedersachsen) |
Timofeev,B.V. The age of a graywache from Lower Saxony. Micropaleontological investigation of samples from the Graywacke of Weesensteiner and Lausitzer. |
1958 |
| details |
Vendian |
|
Sweden |
Timofeev,B.V. On the micropaleontological characteristics of the Visingso Formation |
1960 |
| details |
Early Cambrian |
|
Romania |
Dessila-Codarcea,M. et al. On the presence of metamorphic sediments of the Lower Paleozoic in the Central South Carpathians (Region of Rasinari-Cismadioara-Sadu) |
1967 |
| details |
Late Precambrian |
Early Cambrian |
Arizona |
Downie,C. Palynology of the Chuaria Shales of the Grand Canyon. |
1969 |
| details |
Early Cambrian |
Late Ordovician |
Romania |
Givulescu,R. The fossil flora of Roumania; Second Supplement, first Part. |
1973 |
| details |
Eocambrian |
Cambrian |
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |