| details |
Late Tremadocian |
Early Arenigian |
England(Cumberland) |
Cooper,A.H. et al. The age and correlation of Skiddaw Group (Early Ordovician), sediments in the Cross Fell Inlier (Northern England) |
1990 |
| details |
Late Cambrian |
Early Tremadocian |
Sweden |
Tongiorgi,M. et al. Late Cambrian and Tremadocian phytoplankton (Acritarchs) communities from Oland (Sweden). |
1990 |
| details |
Nd |
|
Nd |
Volkova,N.A. Middle and Upper Cambrian acritarchs in the East-European Platform |
1990 |
| details |
Late Cambrian |
|
USSR(Estonian SSR) |
Kheinsalu,K. et al. Cambrian-Ordovician boundary beds in the Saka Ii section, Northern East Estonia. |
1990 |
| details |
Tremadocian |
|
Jordan |
Keegan,J.B. et al. Palynostratigraphy of the Lower Palaeozoic, Cambrian to Silurian, sediments of the Hashemite Kingdom of Jordan. (In: Special Issue: Circum-Mediterranean Palynology. B.Owens and H.Visscher, editors) |
1990 |
| details |
Tremadocian |
|
Jordan |
Keegan,J.B. et al. Palynostratigraphy of the Lower Palaeozoic, Cambrian to Silurian, sediments of the Hashemite Kingdom of Jordan. (In: Special Issue: Circum-Mediterranean Palynology. B.Owens and H.Visscher, editors) |
1990 |
| details |
Tremadocian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Cambrian |
Tremadocian |
Belgium |
Herbosch,A. et al. Study of the lithostratigraphic, biostratigraphic and sedimentology of the Lessines borehole (Southern Boarder of the Brabant Massive, Belgium) |
1991 |
| details |
Tremadocian |
|
Belgium |
Vanguestaine,M. Acritarch datation of the deepest Cambro-Tremadocian strata of the Lessines borehole (Southern Border of the Brabant Massif, Belgium) |
1991 |
| details |
Early Tremadocian |
|
W.Germany(Bavaria) |
Reitz,E. Acritarchs of Early Tremadoc sediments in the Western Frankenwald area, Northeast Bavaria. |
1991 |
| details |
Llanvirnian |
Caradocian |
England(Cumberland) |
Millward,D. et al. Field and biostratigraphic evidence for an unconformity at the Base of the Eycott Volcanic Group in the English Lake District |
1992 |
| details |
Early Tremadocian |
Late Merioneth |
Canada(Alberta) |
Martin,F. Uppermost Cambrian and Lower Ordovician acritarchs and Lower Ordovician chitinozoans from Wilcox Pass, Alberta. |
1992 |
| details |
Middle Cambrian |
Late Cambrian |
France(Ardennes) |
Ribecai,C. et al. Latest Middle-Late Cambrian acritarchs from Belgium and northern France. (In: Contributions to Acritarch and Chitinozoan Research. S.G.Molyneux and K.J.Doring, editors) |
1993 |
| details |
Middle Cambrian |
Late Cambrian |
Belgium |
Ribecai,C. et al. Latest Middle-Late Cambrian acritarchs from Belgium and northern France. (In: Contributions to Acritarch and Chitinozoan Research. S.G.Molyneux and K.J.Doring, editors) |
1993 |
| details |
Late Cambrian |
Tremadocian |
Iran |
Ghavidel-Syooki,M. Palynological study of Paleozoic sediments of the Chal-I-Sheh area, Southwestern Iran |
1993 |
| details |
Tremadocian |
|
Italy(Sardinia) |
Di Milia,A. et al. Acritarch findings in Early Paleozoic, low-grade metasediments of Sardinia (Italy): A review. |
1993 |
| details |
Late Cambrian |
|
Nd |
Martin,F. Acritarchs: A review |
1993 |