| original |
Frasnian |
|
Canada(NWT,Mackenzie) |
Braman,D.R. et al. The spore genus Archaeoperisaccus and its occurrence within the Upper Devonian Imperial Formation, District of MacKenzie, Canada. |
1985 |
| details |
Frasnian |
|
Canada(NWT,Mackenzie) |
Braman,D.R. et al. Upper Devonian and Lower Carboniferous miospores, Western District of MacKenzie and Yukon Territory, Canada. |
1992 |
| details |
Middle Givetian |
Early Frasnian |
Scotland(Orkney) |
Marshall,J.E.A. et al. Devonian marine Incursions in the Orcadian Basin, Scotland. |
1996 |