| original |
Westphalian D |
|
France |
Lachkar,G. On the systematic position of Triletes saarensis J.Zerndt, 1940. |
1965 |
| details |
Nd |
|
Nd |
Lachkar,G. New definitions of the megaspore genera Valvisisporites and Pseudovalvisisporites and their principal species. |
1968 |
| details |
Westphalian A |
Early Westphalian C |
Czechoslovakia |
KalibovЎ-KaiserovЎ,M. Megaspores from the Zacler Formation in the Intra-Sudetic Basin. |
1977 |
| details |
Pennsylvanian |
|
Gondwanaland |
Shearer,J.C. et al. Delineation of distinctive nature of Tertiary coal beds. |
1995 |