| details |
Wenlockian |
|
England(Shropshire) |
Downie,C. 'Hystrichosheres', (acritarchs), and spores of the Wenlock Shales, (Silurian), of Wenlock, England. |
1963 |
| details |
Silurian |
|
England(Shropshire) |
Downie,C. 'Hystrichosheres', (acritarchs), and spores of the Wenlock Shales, (Silurian), of Wenlock, England. |
1963 |
| details |
Valentian |
|
Algeria |
Deunff,J. et al. Palynoplanktonic correlation in the Cambro-Ordovician of the Sahara |
1961 |
| original |
Wenlockian |
|
England(Shropshire) |
Downie,C. Hystrichospheres from the Silurian Wenlock Shale of England. |
1959 |