| details |
Late Barremian |
Early Aptian |
Gabon |
Doyle,J.A. et al. Diversification of early angiosperm pollen in cladistic context. (In: Pollen and Spores, Patterns of Diversification. S.Blackmore and S.H.Barnes, editors) |
1991 |
| details |
Early Aptian |
|
Maryland |
Doyle,J.A. Revised palynological correlations of the Lower Potomac Group (USA) and the Cocobeach sequence of Gabon (Barremian-Aptian) |
1992 |
| details |
Late Aptian |
Early Albian |
Maryland |
Friis,E.M. et al. Anacostia, a new basal angiosperm from the Early Cretaceous of North America and Portugal with trichotomocolpate/monocolpate pollen. |
1997 |