| original |
Ludlovian |
|
Spain |
Cramer,F.H. Microplankton from three Palaeozoic formations in the Province of Leon, northwest Spain. |
1964 |
| original |
Late Cretaceous |
|
Colorado |
Gies,T.F. Palynology of sediments boardering some Upper Cretaceous strand lines in Northwestern Colorado. |
1972 |
| original |
Stephanian B |
Stephanian C |
Czechoslovakia |
Planderova,E. et al. Biostratigraphic evaluation of Graphiteous Shales in the Zemplin Inselberg area (Eastern Slovakia). |
1981 |
| original |
Ordovician |
|
Bulgaria |
Kalvacheva,R.K. Plankton organism indicative of age. |
1982 |
| original |
Ordovician |
|
Bulgaria |
Kalvacheva,R.K. Plankton organism indicative of age. |
1982 |
| original |
Ordovician |
|
Bulgaria |
Kalvacheva,R.K. Plankton organism indicative of age. |
1982 |
| original |
Ordovician |
|
Bulgaria |
Kalvacheva,R.K. Plankton organism indicative of age. |
1982 |
| original |
Ordovician |
|
Bulgaria |
Kalvacheva,R.K. Plankton organism indicative of age. |
1982 |
| original |
Ordovician |
|
Bulgaria |
Kalvacheva,R.K. Plankton organism indicative of age. |
1982 |
| original |
Ordovician |
|
Bulgaria |
Kalvacheva,R.K. Plankton organism indicative of age. |
1982 |
| original |
Ordovician |
|
Bulgaria |
Kalvacheva,R.K. Plankton organism indicative of age. |
1982 |
| original |
Ordovician |
|
Bulgaria |
Kalvacheva,R.K. Plankton organism indicative of age. |
1982 |
| original |
Ordovician |
|
Bulgaria |
Kalvacheva,R.K. Plankton organism indicative of age. |
1982 |
| original |
Ordovician |
|
Bulgaria |
Kalvacheva,R.K. Plankton organism indicative of age. |
1982 |
| original |
Ordovician |
|
Bulgaria |
Kalvacheva,R.K. Plankton organism indicative of age. |
1982 |
| original |
Ludlovian |
Gedinnian |
Czechoslovakia(Morovia) |
Cambel,B. et al. Biostratigraphic evaluation of Metasediments in the male Karpathy Mts.Region |
1985 |
| original |
Middle Riphean |
Late Riphean |
Zaire |
Baudet,D. Implications of a palynological study in the Upper Precambrian from eastern Kasai and Northwestern Sahaba, Zaire. |
1987 |