| details |
Llandoverian |
Ludlovian |
USSR(Russian Platform) |
Umnova,N.I. Silurian and Ordovician acritarch assemblages from the northern and western parts of the Russian Platform. |
1974 |
| details |
Llandoverian |
Ludlovian |
USSR(Pre-Baltic) |
Umnova,N.I. Silurian and Ordovician acritarch assemblages from the northern and western parts of the Russian Platform. |
1974 |
| details |
Late Ordovician |
Silurian |
USSR(Russian Platform) |
Umnova,N.I. Ordovician and Silurian acritarchs of the Moscow Basin and Prebaltic |
1975 |
| original |
Late Ludlovian |
|
USSR(Kalinin) |
Umnova,N.I. Ordovician and Silurian acritarchs of the Moscow Basin and Prebaltic |
1975 |
| original |
Albian |
Cenomanian |
Australia(W.Australia) |
Cookson,I.C. et al. Microfossils of Australian Mezosoic and Tertiary sediments. Second part. |
1982 |
| details |
Albian |
Cenomanian |
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |