| details |
Late Llanvirnian |
|
W.Germany |
Eisenack,A. et al. Catalog of fossil dinoflagellates, hystrichospheres and related microfossils. Vol.5 Acritarcha. |
1979 |
| details |
Late Llanvirnian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Late Llanvirnian |
|
Germany |
Playford,G. et al. Ordovician acritarch genera Peteinosphaeridium, Liliosphaeridium and Cycloposphaeridium: Morphology, taxonomy, biostratigraphy and palaeogeographic significance |
1995 |