| details |
Visean |
Stephanian |
Europe |
Butterworth,M.A. Densosporites (Berry) Potonie and Kremp, and related genera. Report of CIMP Working Group No.2 |
1964 |
| details |
Visean |
Stephanian |
Turkey |
Butterworth,M.A. Densosporites (Berry) Potonie and Kremp, and related genera. Report of CIMP Working Group No.2 |
1964 |
| details |
Visean |
Stephanian |
USA |
Butterworth,M.A. Densosporites (Berry) Potonie and Kremp, and related genera. Report of CIMP Working Group No.2 |
1964 |
| details |
Chesterian |
|
Kentucky |
Butterworth,M.A. et al. Densosporites Berry 1937 and related genera. |
1963 |