| original |
Middle Pennsylvanian |
Late Pennsylvanian |
Illinois |
Kosanke,R.M. Pennsylvanian spores of Illinois and their use in correlation. |
1950 |
| details |
Desmoinesian |
|
Iowa |
Schemel,M.P. Small spores of the Mystic Coal of Iowa. |
1951 |
| 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 |
|
Missouri |
Jones,D.H. Palynology of the Bevier Coal of Missouri. |
1957 |
| original |
Allegheny |
|
Pennsylvania |
Frederiksen,N.O. Sporomorphs of the Brookville Seam near Brookville, Pennsylvania. |
1961 |
| details |
Maestrichtian |
|
Mexico(Coahuila) |
Rueda-Gaxiola,J. Contribution to the palynologic and petrographic study of the Cretaceous Coal of the Sabina Basin, Coahuila, Mexico |
1967 |