original |
Late Cretaceous |
|
Colorado |
Clarke,R.T. Palynology of Vermejo Formation Coals, (Upper Cretaceous) in the Canon City Coal Field, Fremont County, Colorado |
1963 |
original |
Desmoinesian |
|
Oklahoma |
Dempsey,J.E. A palynological investigation of the Lower and Upper Mcalester Coals (Pennsylvanian) of Oklahoma. |
1964 |
original |
Pennsylvanian |
|
Oklahoma |
Urban,L.L. Palynology of the Drywood and Bluejacket Coals (Pennsylvanian) of Oklahoma. |
1965 |
original |
Permian |
|
Oklahoma |
Morgan,B.E. Palynology of a portion of the El Reno Group (Permian) of Southwest Oklahoma. |
1967 |