| details |
Late Ludlovian |
Emsian |
Germany(Saxony) |
Walter,H. et al. Paleozoic microfossils from the northern Margin of the Erzgebir Mountains, (Saxony). |
1998 |
| details |
Late Gedinnian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Late Gedinnian |
|
Oklahoma |
Wicander,R. A catalogue and biostratigraphic distribution of North American Devonian acritarchs. |
1983 |
| original |
Late Gedinnian |
|
Oklahoma |
Loeblich,A.R.,Jr. et al. Organic-walled microplankton from the Lower Devonian, Late Gedinnian Haragan and Bois d'Arc Formations of Oklahoma, USA. Part 1. |
1976 |