| details |
Carboniferous |
|
Nd |
Roselt,G. Palaobotanic and palaobotanical method and geological investigation. |
1972 |
| details |
Oligocene |
|
Poland |
Turnau,E. Microflora and paleogeography of the Carboniferous Coal deposits in the Polish Carpathians. |
1970 |
| details |
Visean |
Stephanian |
United Kingdom |
Butterworth,M.A. et al. Microspore distribution in the coalfields of Britain |
1960 |
| details |
Early Carboniferous |
|
Canada(NWT,Mackenzie) |
Hacquebard,P.A. Lower Carboniferous spore assemblage in Coal from the South Nahanni River area in Northwestern Canada. |
1955 |