| original |
Eocene |
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 |
| details |
Late Cretaceous |
|
Colorado |
Ames,H.T. Plant microfossils in a Colorado Cretaceous Coal |
1951 |
| details |
Paleozoic |
Recent |
Texas |
Leffingwell,H.A. A study of the variation of the microfossil assemblages within the Vicksburg Formation, Texas. |
1958 |
| details |
Early Jurassic |
Middle Jurassic |
Poland |
Grabowska,I. et al. Flora from the Lower and Middle Jurassic microflora |
1970 |