| details |
Late Cambrian |
Tremadocian |
Spain |
Fombella,M.A. et al. New palynological results from the Oville Formation at Southwest Vozmediano, Leon (northwestern Spain). (In: Commision Internationale De |
1996 |
| details |
Late Precambrian |
Paleozoic |
Worldwide |
Timofeev,B.V. The taxonomy of the most ancient phytoplankton organisms and dispersed spores. (Taxonomy and Methods for the Study of Fossl Pollen and Spores. V.N. Saks and A.F. Khlonova, editors) |
1964 |
| details |
Early Ordovician |
Middle Ordovician |
USSR(Russian Platform) |
Andreeva,E.M. The Upper Proterozoic and Lower Paleozoic microfossils from some Regions of the Russian Platform. (In: Mikrofossilii Drevneishikh Otlozhenii. T.F.Vozzhennikova and T.B.Timofeev, editors) |
1973 |
| details |
Tremadocian |
Merioneth |
Wales |
Downie,C. et al. Changes in the acritarch assemblages at the Tremadoc boundaries in the United Kingdom. |
1979 |
| details |
Middle Cambrian |
Late Cambrian |
Eurasia |
Timofeev,B.V. Proterozoic and early microfossils. (In: Mikrofossilii Drevneishikh Otlozhenii. T.F.Vozzhennikova and T.B.Timofeev, editors) |
1973 |
| details |
Middle Cambrian |
Early Ordovician |
Nd |
Downie,C. Observations on the nature of the acritarchs |
1973 |
| details |
Late Tremadocian |
Early Arenigian |
Estonia |
Paalits,I. Biostratigraphy: Acritarchs |
1990 |
| details |
Precambriam |
Cambrian |
USSR |
Volkova,N.A. Nature and classification of microfossils of plant origin from Precambrian and Lower Paleozoic. |
1965 |
| details |
Late Tremadocian |
Arenigian |
China(Szechwan) |
Xing,Y. Microplants and chitinozoans from the Lower Ordovician Dachengsi Formation of Emeishan, Sichun. |
1980 |
| details |
Nd |
|
Nd |
Cramer,F.H. et al. Lower Paleozoic acritarchs. |
1979 |
| details |
Tremadocian |
|
USSR(Moscow Basin) |
Aristova,K.E. Typical assemblages of Ordovician and Silurian microfossils from the Moscow Syncline. |
1980 |
| details |
Middle Cambrian |
|
USSR(Russian Platform) |
Volkova,N.A. Acritarchs of Middle to Upper Cambrian sediments of the East European Platform. |
1981 |
| details |
Caradocian |
|
Ireland |
Smith,D.G. Progress in Irish Lower Palaeozoic palynology. |
1981 |
| details |
Cambrian |
|
Nd |
Eisenack,A. Hystricosphaeres |
1963 |
| details |
Late Cambrian |
|
USSR(Yaroslav) |
Volkova,N.A. Acritarchs of the Middle and Upper Cambrian in the Moscow Syncline |
1980 |
| details |
Nd |
|
Nd |
Cramer,F.H. et al. Taxonomic considerations on the acritarchs of the Middle and Upper Silurian of northern Spain. |
1968 |
| details |
Late Cambrian |
|
USSR(Estonian SSR) |
Volkova,N.A. et al. New data on Cambrian-Ordovician transitional Beds in the eastern part of the East Baltic. |
1981 |