| original |
Springerian |
|
Oklahoma |
Felix,C.J. et al. Palynology of the Springer Formation of southern Oklahoma, USA. |
1967 |
| details |
Springerian |
|
Oklahoma |
Felix,C.J. et al. Additional knowledge of Pteroretis. |
1969 |
| details |
Chesterian |
|
Iowa |
Urban,J.B. Palynology and the Independence Shale of Iowa. |
1971 |
| details |
Tournaisian |
|
Bulgaria |
Spasov,K. Stratigraphy of the Early Carboniferous of North-East Bulgaria |
1974 |
| details |
Late Mississippian |
|
Arizona |
Billingsley,G.H. et al. Pre-Supai buried valleys. (In: The Supai Group of Grand Canyon. E.D.McKee) |
1982 |