| original |
Middle Cambrian |
Tremadocian |
Spain |
Fombella,M.A. Acritarchs of the Oville Formation, Middle Cambrian-Tremadocian age, Province of Leon, Spain. |
1978 |
| details |
Early Cambrian |
Middle Cambrian |
Canada(Newfoundland) |
Martin,F. et al. Late Early Cambrian and Early Middle Cambrian acritarchs from Manuels River, Eastern Newfoundland. |
1983 |
| details |
Middle Cambrian |
Ordovician |
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Late Vendian |
Early Cambrian |
Poland |
Moczydlowska,M. Acritarch biostratigraphy of the Lower Cambrian and the Precambrian-Cambrian boundary in southeastern Poland. |
1991 |