| details |
Late Eocene |
Early Oligocene |
France(Gard) |
Gruas-Cavagnetto,C. First contribution to the study of the palynoflora of the Celas Formation, (Ales Basin, Gard). |
1973 |
| original |
Allegheny |
|
Pennsylvania |
Frederiksen,N.O. Sporomorphs of the Brookville Seam near Brookville, Pennsylvania. |
1961 |
| details |
Paleozoic |
Recent |
Texas |
Leffingwell,H.A. A study of the variation of the microfossil assemblages within the Vicksburg Formation, Texas. |
1958 |
| details |
Late Cretaceous |
|
Colorado |
Ames,H.T. Plant microfossils in a Colorado Cretaceous Coal |
1951 |
| original |
Oligocene |
Miocene |
Texas |
Wilson,L.R. et al. Fossil spores and pollen of the Bender No.1 and B.D.Griffin No.5 wells, Montgomery County, Texas. |
1949 |