| original |
Maastrichtian |
|
North Dakota |
Bergad,R.D. Ultrastructural studies of selected North American Cretaceous megaspores of Minerisporites, Erlandsonisporites, Horstiporites, and Ricinospora, nov.gen. |
1978 |
| original |
Barremian |
Aptian |
China(Inner Mongolia) |
Li,W. et al. Early Cretaceous megaspores from the Jalainor Group of northeast Inner Mongolia, P.R.China. |
1987 |
| details |
Nd |
|
Nd |
Batten,D.J. et al. Catalog of Mesozoic and Tertiary megaspores |
1990 |
| details |
Cretaceous |
|
Nd |
Collinson,M.E. Diversification of modern Heterosporous Pteridophytes. (In: Pollen and Spores, Patterns of Diversification. S.Blackmore and S.H.Barnes, editors) |
1991 |