| original |
Early Caradocian |
|
Poland |
Gгrka,H. Microorganisms of the Ordovician of Poland. |
1969 |
| details |
Ordovician |
|
Poland |
Jagielska,L. Flora of the Ordovician;Microflora |
1972 |
| details |
Early Caradocian |
|
Poland |
Eisenack,A. et al. Catalog of fossil dinoflagellates, hystrichospheres and related microfossils. Acritarchs. |
1973 |
| details |
Caradocian |
|
Nd |
Diez,M.D.C.R. et al. Range chart of selected Lower Paleozoic acritarch Taxa. |
1974 |
| details |
Middle Ordovician |
|
Finland |
Tynni,R. Ordovician hystrichospheres and chitinozoans in limestone from the Bothnian Sea. |
1975 |
| details |
Middle Ordovician |
|
USSR(Estonian SSR) |
Aristova,K.E. Assemblages of microplant fossils of Lower and Middle Ordovician type sections of Estonia |
1976 |
| details |
Caradocian |
|
Poland |
Gгrka,H. The Middle Ordovician acritarchs of Olsztyn IG2, (Poland). |
1979 |
| details |
Early Ordovician |
Late 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 |
Middle Ordovician |
|
Sweden |
Gгrka,H. Middle Ordovician (Viruan) acritarchs and Prasinophyceae from the Smedsby Gard No.1 borehole in (Gotland, Sweden). |
1987 |
| details |
Early Caradocian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |