| original |
Late Cretaceous |
|
Wyoming |
Andrews,H.N. et al. On the flora of the Frontier Formation of Southwestern Wyoming. |
1941 |
| original |
Frasnian |
|
Nd |
Combaz,A. Presentation of the Laboratory of Palynology of the French Petroleum Company-Activities and results. |
1963 |
| original |
Eifelian |
|
Nd |
Bonamo,P.M. et al. Calamophyton in the Middle Devonian of New York State. |
1966 |
| original |
Desmoinesian |
|
Iowa |
Baxter,R.W. A revision of the Sphenopsid organ genus, Litostrobus |
1967 |
| original |
Frasnian |
|
New York |
Bonamo,P.M. et al. Tetraxylopteris, Schmidtii. Its fertile Parts and its relationships within the Aneurophytales. |
1967 |