| details |
Chesterian |
|
Illinois |
Winslow,M.R. Upper Mississippian and Pennsylvanian megaspores and other plant microfossils from Illinois. |
1959 |
| details |
Chesterian |
|
Indiana |
Spinner,E. Further studies on the megaspore genus Setispora Butterworth and Spinner,1967. |
1982 |
| details |
Mississippian |
|
Indiana |
Potonie,R. Synopsis of the genera of the sporae dispersae. Part 2 |
1958 |
| details |
Early Carboniferous |
|
England(Northumberland) |
Mortimer,M.G. In situ megaspores from Lepidostrobophyllum finbriatum (Kidston) Allen from the Lower Carboniferous of North-West England. (In: Studies in Palaeobotany and Palynology in Honor of N.F.Hughes. D.J.Batten and D.E.G.Briggs, editors) |
1986 |
| original |
Chesterian |
|
Indiana |
Chaloner,W.G. Mississippian megaspores from Michigan and adjacent states. |
1954 |