| original |
Ordovician |
|
USSR(Kalinin) |
Umnova,N.I. et al. Acritarchs from the Yaroslavskoi series of the northern part of the Russian Platform |
1970 |
| original |
Middle Ordovician |
|
Sweden |
Kjellstrжm,G. Ordovician microplankton (baltisphaerids) from the Grotlingbo borehole No.1 in Gotland, Sweden. |
1971 |
| details |
Nd |
|
Nd |
Martin,F. Acritarchs of the Lower Ordovician of the Montagne Noire (Herault, France). |
1972 |
| details |
Ordovician |
|
Sweden |
Eisenack,A. et al. Catalog of fossil dinoflagellates, hystrichospheres and related microfossils. Acritarchs. |
1973 |
| details |
Ordovician |
|
Nd |
Kjellstrжm,G. Baltisphaeridium Multiechinatum Nom. Nov. Pro Baltisphaeridium Echinatum Kjellstrom, 1971. |
1974 |
| details |
Llanvirnian |
Llandeilian |
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 |
Late Ordovician |
|
Indiana |
Colbath,G.K. Organic-walled microphytoplankton from the Eden Shale, (Upper Ordovician), Indiana, USA. |
1979 |
| details |
Tremadocian |
Arenigian |
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 |
Late Tremadocian |
Early Arenigian |
USSR(European) |
Rybnikova,M.B. et al. Differentiation of Lower Ordovician terrigenous /Sediments in the Moscow Syneclise |
1984 |
| details |
Middle Ordovician |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Ordovician |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Arenigian |
Llanvirnian |
Sweden |
Righi,E. Ampullula, a new acritarch genus from the Ordovician (Arenig-Llanvirn) of Oland, Sweden. |
1991 |