| original |
Givetian |
|
Ohio |
Wicander,R. et al. Systematics and biostratigraphy of the organic-walled microphytoplankton from the Middle Devonian, (Givetian), Silica Formation, Ohio, USA. |
1981 |
| details |
Givetian |
|
Ohio |
Wicander,R. A catalogue and biostratigraphic distribution of North American Devonian acritarchs. |
1983 |
| details |
Early Givetian |
Middle Givetian |
North America |
Wicander,R. Middle Devonian acritarch biostratigraphy of North America |
1984 |
| details |
Givetian |
|
Kentucky |
Wood,G.D. et al. Organic-walled microphytoplankton and chitinozoans from the Middle Devonian, (Givetian) Boyle Dolomite of Kentucky, USA. |
1985 |
| details |
Givetian |
|
Canada(Ontario) |
Wicander,R. et al. Palynomorphs from the Middle Devonian, (Givetian) Arkona Hungry Hollow and Widder Formations, Hungry Hollow Ontario, Canada and their biostratigraphic significance. |
1985 |
| details |
Givetian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Nd |
|
Nd |
Molyneux,S.G. et al. Paleozoic phytoplankton. (Principles and Applications. Applications. J.Jansonius and D.C.McGregor, editors.) |
1996 |
| details |
Late Givetian |
|
Iowa |
Wicander,R. et al. The use of microphytoplankton and chitinozoans from interpretin transgressive/regressive cycles in the Rapid Member of the Ceda Valley Formation (Middle Devonian), Iowa. |
1997 |