| details |
Early Ordovician |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Ludlovian |
|
USSR(Siberia) |
Sheshegova,L.I. Comparison of a Silurian acritarch complex and lithogenesis. (In: The Fauna and Biostratigraphy of Upper Ordovician and Silurian of the Altai-Sajan Region) |
1978 |
| details |
Proterozoic |
|
Australia(N.Territory) |
Peat,C.J. et al. Proterozoic microfossils from the Roper Group, northern Territory, Australia. |
1978 |
| details |
Ordovician |
|
Poland |
Jagielska,L. Flora of the Ordovician;Microflora |
1972 |
| details |
Early Ordovician |
|
Poland |
Timofeev,B.V. Micropaleophytological research into ancient strata. |
1966 |
| details |
Late Gothlandian |
|
USSR(Moldavian SSR) |
Timofeev,B.V. Micropaleophytological research into ancient strata. |
1966 |