| original |
Leonardian |
|
Texas |
Jizba,K.M. Late Paleozoic bisaccate pollen from the United States Midcontinent area. |
1962 |
| details |
Permian |
|
France(Loire) |
Boulouard,C. Contribution to the study of the "Saccates": Essay of morphographic classification and stratigraphic application. |
1963 |
| details |
Wolfcampian |
|
Texas |
Tschudy,R.H. et al. Early Permian Vesiculate pollen from Texas, USA. |
1966 |
| details |
Leonardian |
|
Texas |
Tschudy,R.H. et al. Early Permian Vesiculate pollen from Texas, USA. |
1966 |
| details |
Middle Permian |
|
Texas |
Potonie,R. Synopsis of the genera of the sporae dispersae. Part 5. Supplement to all Groups (Turmae). |
1970 |
| details |
Virgilian |
Early Wolfcampian |
Texas |
Pashuck,R.J. et al. Palynological zones of the Wichita Group of North Central Texas and their correlation with the Gearyan Stage of Kansas and Dunkard Group of West Virginia. |
1979 |