| original |
Early Devonian |
Middle Devonian |
England(Oxfordshire) |
Chaloner,W.G. Early Devonian spores from a borehole in Southern England. |
1963 |
| details |
Siegenian |
Emsian |
Spitsbergen |
Allen,K.C. Lower and Middle Devonian spores of North and Central Vestspitsbergen |
1965 |
| details |
Early Devonian |
Middle Devonian |
England(Oxfordshire) |
Streel,M. Lower Devonian spores from Belgium and their stratigraphic significance |
1967 |
| details |
Emsian |
Eifelian |
Spitsbergen |
Allen,K.C. Spore assemblages and their stratigraphical application in the Lower and Middle Devonian of North and Central Vestspitbergen |
1967 |
| details |
Siegenian |
Emsian |
England(Oxfordshire) |
Poole,E.G. The stratigraphy of the geological survey Apley Barn borehole, Witney, Oxfordshire |
1969 |