| details |
Middle Ordovician |
|
Sweden |
Kjellstrжm,G. Middle Ordovician microplankton from the Grotlingbo borehole No.1 in Gotland, Sweden. |
1971 |
| details |
Early Caradocian |
|
Poland |
Kjellstrжm,G. Middle Ordovician microplankton from the Grotlingbo borehole No.1 in Gotland, Sweden. |
1971 |
| details |
Middle Ordovician |
|
Sweden |
Kjellstrжm,G. Lower Viruan microplankton from a Boring in Oland, Sweden |
1972 |
| details |
Middle Ordovician |
|
Finland |
Tynni,R. Ordovician hystrichospheres and chitinozoans in limestone from the Bothnian Sea. |
1975 |
| details |
Middle Ordovician |
|
Sweden |
Kjellstrжm,G. Lower Viruan Middle Ordovician microplankton from the Ekon borehole No.1 in Ostergotland, Sweden. |
1976 |
| details |
Ordovician |
|
Sweden |
Eisenack,A. Microfossils of the Vaginatum Limestone of Halludden, Oland. |
1976 |
| details |
Llanvirnian |
Caradocian |
Poland |
Gгrka,H. The Middle Ordovician acritarchs of Olsztyn IG2, (Poland). |
1979 |
| details |
Early Llanvirnian |
Caradocian |
Poland |
Gгrka,H. Middle Ordovician microplankton from Strabla (Poland). |
1980 |
| details |
Early Llanvirnian |
Caradocian |
Baltic |
Gгrka,H. Middle Ordovician microplankton from Strabla (Poland). |
1980 |
| details |
Arenigian |
|
USSR(Moscow Basin) |
Aristova,K.E. Typical assemblages of Ordovician and Silurian microfossils from the Moscow Syncline. |
1980 |
| details |
Early Ordovician |
|
Finland |
Tynni,R. On Paleozoic microfossils in clastic dykes on the …land Islands and in the core samples of Lumparn. (In: Paleozoic sediments in the Rapakivi area of the …land Islands. L. Bergman, R. Tynni and B. Winterhalter, editors.) |
1982 |
| details |
Wenlockian |
Ludlovian |
Saudi Arabia |
Fauconnier,D. Palynological study of Formations of Tertiary Upper Cretaceous, Devonian, Silurian, and Ordovician intersected in 11 boreholes in Northwestern of Royaume, Saudi Arabia (RS.1717) |
1984 |
| details |
Early Tremadocian |
|
Poland |
Kowalczewski,Z. et al. New data on Cambrian and Lower Ordovician rocks in the vicinity of Wisniowka in the Gory Swieto Krzyskie Mountains. |
1986 |
| details |
Middle Ordovician |
|
Sweden |
Gгrka,H. Middle Ordovician (Viruan) acritarchs and Prasinophyceae from the Smedsby Gard No.1 borehole in (Gotland, Sweden). |
1987 |
| details |
Late Arenigian |
Caradocian |
Finland |
Uutela,A. Age and dispersal of sedimentary erratics on the coast of southwestern Finland. |
1989 |
| details |
Late Arenigian |
Llanvirnian |
USSR(Estonian SSR) |
Uutela,A. Age and dispersal of sedimentary erratics on the coast of southwestern Finland. |
1989 |
| details |
Ordovician |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |