| original |
Visean |
|
Niger |
Lachkar,G. The Visean age of the Agade Coal Basin, (Niger). II. |
1978 |
| details |
Carboniferous |
Permian |
Gondwanaland |
Pi©rart,P. Some remarks concerning the megaspores of Gondwana. |
1978 |
| details |
Late Visean |
|
Niger |
Lachkar,G. et al. Affinity of the coal-bearing formations of Agades, Niger. |
1979 |
| details |
Carboniferous |
|
Africa |
Pi©rart,P. Stratigraphical and geographical distribution of Gondwana megaspores. |
1980 |
| details |
Carboniferous |
|
South America |
Pi©rart,P. Stratigraphical and geographical distribution of Gondwana megaspores. |
1980 |