| original |
Dittonian |
|
England(Shropshire) |
Edwards,D. et al. Lower Devonian (Dittonian) plants from the Welsh Borderland. |
1974 |
| details |
Devonian |
|
Nd |
Gensel,P.G. Devonian in situ, spores: A survey and discussion. |
1980 |
| details |
Early Devonian |
|
Nd |
Allen,K.C. A review of in situ, Late Silurian and Devonian spores. |
1980 |
| details |
Lochkovian |
Pragian |
Nd |
Edwards,D. et al. In situ, pollen and spores in plant evolution. 14A -Review of in situ, spores in early land plants. (Principles and Applications. Applications. J.Jansonius and D.C.McGregor, editors.) |
1996 |