| details |
Early Silurian |
|
USSR(Moscow Basin) |
Zalessky,M.D. On marine sapropelite of Silurian age, formed by blue-green alga. |
1917 |
| details |
Middle Eocene |
|
Colorado |
Bradley,W.H. Origin and microfossils of the oil shales of the Green River Formation of Colorado and Utah. |
1931 |
| details |
Middle Eocene |
|
Colorado |
Bradley,W.H. Origin and microfossils of the oil shales of the Green River Formation of Colorado and Utah. |
1931 |
| details |
Middle Eocene |
|
Utah |
Bradley,W.H. Origin and microfossils of the oil shales of the Green River Formation of Colorado and Utah. |
1931 |
| details |
Middle Eocene |
|
Utah |
Bradley,W.H. Origin and microfossils of the oil shales of the Green River Formation of Colorado and Utah. |
1931 |
| details |
Late Eocene |
Early Oligocene |
Australia(W.Australia) |
Balme,B.E. et al. Tertiary sediments at Coolgardie, Western Australia |
1959 |
| details |
Precambriam |
|
USSR(Siberia) |
Mendelson,C.V. et al. Proterozoic microfossils from the Sukhaya Tunguska, Shorikha, and Yudoma Formations of the Siberian Platform, USSR. |
1982 |
| details |
Middle Riphean |
|
USSR(Urals) |
Sergeeva,V.N. Microfossils in Cherts from the Middle Riphean (Mesoprotozoic) Avzyan Formation, Southern Ural Mountinas, Russian Federation |
1994 |