| original |
Late Permian |
|
USSR(Siberia) |
Maheshwari,H.K. et al. Cladostrobus and the systematics of Cordaitalean Leaves. |
1975 |
| details |
Carboniferous |
Permian |
USSR(Siberia) |
Meyen,S.V. The Carboniferous and Permian floras of Angaraland (A Synthesis). |
1982 |
| details |
Nd |
|
Nd |
Balme,B.E. Fossil in situ, spores and pollen grains: An annotated catalogue. |
1995 |
| details |
Roadian |
|
Canada(Arctic) |
Utting,J. Paleozoic spores and pollen. Chapter 18F Illustrations of Permi spores and pollen. (Principles and Applications. Applications. J.Jansonius and D.C.McGregor, editors.) |
1996 |