original |
Westphalian A |
|
England |
Balme,B.E. et al. The stratigraphical significance of certain fossil spores in the central group of British coalfields. |
1952 |
original |
Early Westphalian D |
|
Germany(Rhineland) |
Bharadwaj,D.C. The spore flora of Velener Schichten (Lower Westphalian D) in the Ruhr Coal Measures. |
1957 |
original |
Early Permian |
|
China(Shansi) |
Ouyang,S. A preliminary report on sporae dispersae from the Lower Shihhotze series of Hoku District northwest Shansi |
1964 |
original |
Desmoinesian |
|
Oklahoma |
Dempsey,J.E. A palynological investigation of the Lower and Upper Mcalester Coals (Pennsylvanian) of Oklahoma. |
1964 |