| details |
Late Namurian |
Westphalian A |
Iowa |
Ravn,R.L. et al. A Morrowan, (Upper Carboniferous), miospore flora from eastern Iowa, USA. |
1982 |
| details |
Morrowan |
Atokan |
Iowa |
Ravn,R.L. Palynostratigraphy of the Lower and Middle Pennsylvanian Coals of Iowa |
1986 |
| details |
Late Tournaisian |
Visean |
Alaska |
Ravn,R.L. Miospores of the Kekiktuk Formation (Lower Carboniferous), Endicott Field Area, Alaska North Slope. |
1991 |
| details |
Late Meramecian |
Chesterian |
Canada(NWT) |
Braman,D.R. et al. Palynology and paleoecology of the Mattson Formation, northwest Canada. |
1977 |