original |
Early Cretaceous |
|
Italy |
Trevisan,L. Ultrastructural notes and considerations on Ephedripites, Eucommiidites and monosulcites pollen grains from Lower Cretaceous sediments of Southern Tuscany, (Italy). |
1980 |
original |
Nd |
|
Nd |
Osborn,J.M. et al. The ultrastructure of Sahnia pollen (Pentoxylales) |
1991 |
original |
Early Cretaceous |
|
Italy |
Kedves,M. Tranmission Electron Microscopy of the Fossil Gymnosperm Exines. |
1994 |
original |
Early Cretaceous |
|
Wyoming |
Osborn,J.M. et al. Pollen morphology and Ulstructure of the Bennettitales: in situ, pollen of Cycadeoidea |
1995 |
original |
Early Cretaceous |
|
South Dakota |
Osborn,J.M. et al. Pollen morphology and Ulstructure of the Bennettitales: in situ, pollen of Cycadeoidea |
1995 |