| original |
Late Artinskian |
|
Congo |
Kar,R.K. et al. Palaeozoic sporae dispersae from Congo. 3. Layers of black shale of the Lukuga. |
1967 |
| details |
Early Permian |
Middle Permian |
Congo |
Maheshwari,H.K. et al. Palaeozoic sporae dispersae from Congo. 8. The Kibamba River (Lukuga Coalfield area). |
1969 |
| details |
Permian |
|
Congo |
Kar,R.K. et al. Palaeozoic sporae dispersae from Zaire (Congo). 12. Assise a Couches De Houille from Greinerville Region. |
1976 |
| details |
Late Artinskian |
|
Congo |
Ravn,R.L. Palynostratigraphy of the Lower and Middle Pennsylvanian Coals of Iowa |
1986 |
| details |
Late Artinskian |
|
Congo |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |