original |
Pennsylvanian |
|
Oklahoma |
Clarke,R.T. Palynology of the Secor Coal (Pennsylvanian) of Oklahoma |
1961 |
original |
Pennsylvanian |
|
Oklahoma |
Urban,L.L. Palynology of the Drywood and Bluejacket Coals (Pennsylvanian) of Oklahoma. |
1965 |
original |
Middle Pennsylvanian |
|
Oklahoma |
Dolly,E.D. Palynology of the Bevier Coal (Pennsylvanian ) of Oklahoma. |
1965 |
original |
Early Liassic |
|
Luxembourg |
Hiltmann,W. On the spore-guides of the core profile of the borehole Contern Fg 11 |
1967 |
original |
Badenian |
|
Poland |
Jachowicz,S. et al. Genesis of hard coal boulders in Sandstones of the Miocene Debowiec Formation |
1987 |