| details |
Wenlockian |
|
England(Shropshire) |
Downie,C. 'Hystrichosheres', (acritarchs), and spores of the Wenlock Shales, (Silurian), of Wenlock, England. |
1963 |
| details |
Emsian |
Famennian |
China(Ningsia Hui) |
Gao,L. Description of spores and the discussion on their age. (In: Continental Devonian system of Ningxia and its Biotas. (J. Pan et al,editors) |
1987 |
| details |
Early Devonian |
Middle Devonian |
China(Kweichow) |
Kao,L. et al. Early and Middle Devonian spore assemblages from Tushan and Duyun of Kweichow and their stratigraphical significane. |
1975 |