| original |
Campanian |
|
Nigeria |
Odebode,M.O. et al. Ariadnaesporites, (Salviniaceae), from the Cretaceous of Nigeria. |
1980 |
| details |
Late Campanian |
Maastrichtian |
Nigeria |
Kumaran,K.P.N. et al. An Upper Cretaceous assemblage from the Nkporo Shale of Calabar Blank, Nigeria. |
1986 |
| details |
Campanian |
Maastrichtian |
Worldwide |
Kovach,W.L. et al. Worldwide stratigraphic occurrences of Mesozoic and Tertiary megaspores. |
1989 |
| details |
Campanian |
|
Nigeria |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |
| details |
Early Maestrichtian |
|
Nigeria |
Kumaran,K.P.N. et al. A reappraisal of Salviniaceous fossils and its implication on the age and depositional environment of Nkporo Shale of Calabar Flank, Nigeria |
1994 |