| details |
Desmoinesian |
|
Oklahoma |
Wilson,L.R. et al. Plant microfossils of the Croweburg Coal. |
1956 |
| details |
Late Westphalian B |
|
W.Germany(N.Rhine) |
Potonie,R. et al. The sporae dispersae of the Ruhr Carboniferous, their morphography and stratigraphy with reviews of species of other areas. Part 1. |
1955 |
| details |
Westphalian C |
|
Canada(Nova Scotia) |
Somers,G. A preliminary study of the spores from the Phalen Seam in the New Waterford District, Sydney Coal-Field, Nova Scotia. |
1952 |
| details |
Desmoinesian |
|
Iowa |
Schemel,M.P. Small spores of the Mystic Coal of Iowa. |
1951 |
| details |
Westphalian B |
|
Canada(Nova Scotia) |
Malloy,R.E. Carboniferous plant spores of the No.40 Brine Seam, Joggins, Nova Scotia. |
1951 |
| original |
Middle Pennsylvanian |
Late Pennsylvanian |
Illinois |
Kosanke,R.M. Pennsylvanian spores of Illinois and their use in correlation. |
1950 |