| original |
Late Tremadocian |
Early Arenigian |
Italy(Sardinia) |
Pittau Demelia,P. Tremadocian (Early Ordovician) acritarchs of the Arburese Unit southwest Sardinia, (Italy). |
1985 |
| details |
Late Tremadocian |
Early Arenigian |
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Late Cambrian |
|
Wales(Gwynedd) |
Martin,F. Acritarchs: A review |
1993 |
| details |
Late Cambrian |
|
Wales(Gwynedd) |
Young,T. et al. Cambrian stratigraphy of St.Tudwal's Peninsula, Gwynedd, Northwest Wales |
1994 |