original |
Late Barremian |
Early Aptian |
Gabon |
Doyle,J.A. et al. Early Cretaceous tetrads, Zonasulculate pollen and Winteraceae. 1: Taxonomy, morphology and ultrastructure. |
1990 |
original |
Barremian |
Aptian |
North America |
Doyle,J.A. et al. Early Cretaceous tetrads, zonasulcate pollen and Winteraceae. 2: Cladistic analysis and implication implications. |
1990 |
original |
Aptian |
Albian |
Egypt |
Ibrahim,M.I.A. et al. Palynostratigraphy of Jurrasic to Lower Cretaceous sequences from the Eastern Desert of Egypt. |
2001 |