| details |
Frasnian |
|
Kentucky |
Martin,S.J. et al. A biostratigraphic analysis of core samples from wells drilled in the Devonian shale interval of the Appalachian and Illinois Basin |
1978 |
| original |
Givetian |
Frasnian |
Tennessee |
Reaugh,A.B. A new species of Cymatiosphaera (Acritarcha) with constant field tabulation from the Devonian of Tennessee. |
1978 |
| details |
Givetian |
Frasnian |
Tennessee |
Wicander,R. A catalogue and biostratigraphic distribution of North American Devonian acritarchs. |
1983 |
| details |
Early Givetian |
Middle Frasnian |
North America |
Wicander,R. Middle Devonian acritarch biostratigraphy of North America |
1984 |
| details |
Givetian |
Frasnian |
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |