| original |
Middle Ordovician |
|
Sweden |
Kjellstrжm,G. Ordovician microplankton (baltisphaerids) 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 |
Ordovician |
|
Sweden |
Eisenack,A. et al. Catalog of fossil dinoflagellates, hystrichospheres and related microfossils. Acritarchs. |
1973 |
| details |
Llanvirnian |
Llandeilian |
Nd |
Diez,M.D.C.R. et al. Range chart of selected Lower Paleozoic acritarch Taxa. |
1974 |
| details |
Middle Ordovician |
|
Sweden |
Kjellstrжm,G. Lower Viruan Middle Ordovician microplankton from the Ekon borehole No.1 in Ostergotland, Sweden. |
1976 |
| details |
Caradocian |
|
Canada(Quebec) |
Martin,F. Some Upper Ordovician chitinozoans and acritarchs from the White Head Formation of Gaspe, Quebec. Gaspesie, Quebec. |
1980 |
| details |
Ordovician |
Silurian |
France(Lot-et-Garonne) |
Baudelot,S. et al. Paleozoic basins hidden under the Aquitaine: Micropaleontological study of core collected during petroleum investigations. (In: Program of deep geology of France first phase of investigation-1983-1984) |
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 |
Early Tremadocian |
|
Spain |
Fombella Blanco,M.A. Diachronism and palynology of the Cambrian-Ordovician transition of the Province of Leon, northern Spain |
1986 |
| details |
Tremadocian |
Arenigian |
China(Shanghai) |
Hu,Y. Micropalaeoflora from the Early Ordovician in Gaoqiao Region of Shaanxi and its stratigraphic significance. |
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 |
Middle Ordovician |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Arenigian |
|
China(Szechwan) |
Fang,X. Ordovician microflora from Ningqiang (Shaanxi) and Guangyuan (Sichuan) and its sedimentary environment. |
1990 |
| details |
Llanvirnian |
Baoto |
China(Szechwan) |
Lai,C.-G. et al. Restudy on Ordovician of Southern Shaanxi-Northern Sichuan areas. |
1990 |
| details |
Llanvirnian |
Baoto |
China(Shansi) |
Lai,C.-G. et al. Restudy on Ordovician of Southern Shaanxi-Northern Sichuan areas. |
1990 |
| details |
Arenigian |
Llanvirnian |
Sweden |
Righi,E. Ampullula, a new acritarch genus from the Ordovician (Arenig-Llanvirn) of Oland, Sweden. |
1991 |
| details |
Arenigian |
Early Llanvirnian |
China(Hupei) |
Yin,L. Early Ordovician acritarchs from Hunjiang Region, Jilin and Yichang Region, Hubei, China. |
1995 |