| original |
Early Ordovician |
|
Sweden |
Eisenack,A. A report on Leiospheres and on the Pylom of Hystrichospheres |
1962 |
| details |
Nd |
|
Nd |
Downie,C. et al. Bibliography and index of fossil dinoflagellates and acritarchs. |
1965 |
| details |
Ordovician |
|
Baltic |
Sarjeant,W.A.S. The Xanthidia: The solving of a palaeontological problem. |
1967 |
| details |
Early Ordovician |
|
Sweden |
Eisenack,A. On the reproduction of Palaeozoic hystrichospheres. |
1968 |
| details |
Early Ordovician |
|
Baltic |
Sarjeant,W.A.S. Xanthidia, Palinospheres and "Hystrix": A review of the study of fossil unicellular microplankton with organic cell walls. |
1970 |
| details |
Tremadocian |
Arenigian |
Nd |
Diez,M.D.C.R. et al. Range chart of selected Lower Paleozoic acritarch Taxa. 2: Index to Parts 1 and 2. |
1977 |
| details |
Early Ordovician |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |