| original |
Caradocian |
|
Ohio |
Loeblich,A.R.,Jr. et al. Some Middle and Late Ordovician microphytoplankton from Central North America. |
1978 |
| details |
Edenian |
|
Ohio |
Colbath,G.K. Cynonymy of Edenian, (Late Ordovician), organic-walled microphytoplankton taxa. |
1981 |
| details |
Late Caradocian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Early Ordovician |
|
Jordan |
Basha,S.H. Palynomorphs from Ordovician-Silurian subsurface rocks of Wadi Sirhan, East Jordan |
1990 |