| original |
Givetian |
|
Iowa |
Sanders,R.B. Devonian spores of the Cedar Valley Coal of Iowa, USA. |
1967 |
| details |
Late Givetian |
Frasnian |
North America |
McGregor,D.C. Devonian miospores of N.America. |
1979 |
| details |
Middle Frasnian |
|
Canada(Alberta) |
McGregor,D.C. Devonian miospores of N.America. |
1979 |
| details |
Late Givetian |
Frasnian |
Iowa |
Playford,G. et al. Laiphospora, a new genus of Trilete sporae dispersae from the Devonian of North America. |
1983 |
| details |
Middle Frasnian |
|
Canada(NWT,Mackenzie) |
Playford,G. et al. Laiphospora, a new genus of Trilete sporae dispersae from the Devonian of North America. |
1983 |