| details |
Ypresian |
|
Nd |
Sarjeant,W.A.S. et al. The Micrhystridium and Veryhachium Complexes (Acritarcha: Acanthomorphitae and Polygonomorphitae): A taxonomic reconsideration. |
1994 |
| details |
Ypresian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Ypresian |
Lutetian |
Netherlands |
De Coninck,J. Organic walled microfossils from the Eocene of the Woensdrecht borehole, Southern Netherlands |
1977 |
| original |
Ypresian |
|
Belgium |
De Coninck,J. Dinophyceae and acritarcha from the Ypresian of the Kallo Boring. |
1969 |
| details |
Ypresian |
|
Belgium |
De Coninck,J. Ypresian organic walled microfossils from the Belgian Basin. |
1975 |