| original |
Caradocian |
|
Indiana |
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 |
Caradocian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Ashgillian |
|
China(Zeijing) |
He,S.-C. et al. Late Ordovician acritarchs from changwu Formation of Jiangshan, Zhejiag, China |
1993 |
| details |
Middle Ordovician |
Late Ordovician |
Iran |
Ghavidel-Syooki,M. Acritarch biostratigraphy and palaeogeography of Lower Palaeozoic rock units at Southwestern Kashmar City, Central Iran. |
1998 |