| original |
Middle Cambrian |
Tremadocian |
Spain |
Fombella,M.A. Acritarchs of the Oville Formation, Middle Cambrian-Tremadocian age, Province of Leon, Spain. |
1978 |
| details |
Middle Cambrian |
Early Tremadocian |
Spain |
Fombella,M.A. Palynology of the Oville Formation, north and south Cantabrian Mountains. |
1978 |
| details |
Cambrian |
Tremadocian |
USSR(Estonian SSR) |
Volkova,N.A. The age of the Ulgazek Series at the Cambrian - Ordovician contact in Estonia. |
1982 |
| details |
Late Ordovician |
|
Czechoslovakia |
VavrdovЎ,M. Some plant microfossils of possible terrestrial origin from the Ordovician of Central Bohemia. |
1984 |
| details |
Early Tremadocian |
|
Spain |
Fombella Blanco,M.A. Diachronism and palynology of the Cambrian-Ordovician transition of the Province of Leon, northern Spain |
1986 |
| details |
Late Ordovician |
|
Czechoslovakia |
VavrdovЎ,M. Further acritarchs and terrestrial plant remains from the Late Orovician at Hlasna Treban (Czechoslovakia) |
1988 |
| details |
Ashgillian |
Early Llandoverian |
Czechoslovakia |
VavrdovЎ,M. New acritarchs and miospores from the Late Ordovician of Hlasna Treban, Czechoslovakia. |
1989 |
| details |
Middle Cambrian |
Early Ordovician |
Spain |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |