| details |
Early Devonian |
Middle Devonian |
USSR(European) |
Kedo,G.I. et al. Spores. (In: Colloquia on the fauna and flora of the Lower and Middle Devonian boundary Layers in the USSR.) |
1978 |
| details |
Late Gedinnian |
Siegenian |
USSR(Estonian SSR) |
Spasskiy,N.Y. Spores: Gedinian to Early Eifelian, Late Middle Devonian boundary at the Base of Takada, Salairka and Pyarnees species list. (In: A Colloquia on the fauna and flora of Lower to Middle Devonian horizons of USSR) |
1978 |
| details |
Late Gedinnian |
Siegenian |
USSR(Tyumenskaya Oblast) |
Spasskiy,N.Y. Spores: Gedinian to Early Eifelian, Late Middle Devonian boundary at the Base of Takada, Salairka and Pyarnees species list. (In: A Colloquia on the fauna and flora of Lower to Middle Devonian horizons of USSR) |
1978 |