| original |
Tremadocian |
Arenigian |
Italy(Sardinia) |
Albani,R. et al. New palynological data and geological considerations on the age of the Solanas Sandstone (Cambrian-Ordovician-Central Sardinia) |
1985 |
| original |
Tremadocian |
|
Algeria |
Combaz,A. On a microbiota of Tremadocian age at Hassi-Messaoud. |
1967 |
| original |
Middle Wenlockian |
Early Ludlovian |
Belgium |
Martin,F. The acritarchs from the Belgian Ordovician and Silurian. Determination and stratigraphic value. |
1968 |
| original |
Middle Cambrian |
|
Belgium |
Vanguestaine,M. Discovery of acritarchs in the Upper Revinian of the Stavelot Massif. |
1967 |
| original |
Late Arenigian |
|
Italy(Sardinia) |
Tongiorgi,M. et al. The Solanas Sandstone of Central Sadinia: New paleontological data, (acritarchs) and an attempt of geological interpretation, (A "Post-Sardinian" Molasse). |
1984 |
| original |
Early Ordovician |
|
USSR(Estonian SSR) |
Kheinsalu,K. et al. Cambrian-Ordovician boundary beds in the Saka Ii section, Northern East Estonia. |
1990 |
| original |
Arenigian |
|
Italy(Sardinia) |
Albani,R. Ordovician, (Arenigian) acritarchs from the Solanas Sandstone Formation, Central Sardinia, Italy. |
1989 |