| original |
Middle Cambrian |
Tremadocian |
Spain |
Fombella,M.A. Acritarchs of the Oville Formation, Middle Cambrian-Tremadocian age, Province of Leon, Spain. |
1978 |
| details |
Middle Cambrian |
Tremadocian |
Spain |
Martin,F. et al. Late Early Cambrian and Early Middle Cambrian acritarchs from Manuels River, Eastern Newfoundland. |
1983 |
| details |
Nd |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Ordovician |
|
Nd |
Servais,T. An annotated bibliographical review of Ordovician acritarchs |
1997 |