| details |
Late Eocene |
|
USSR(Kazakh SSR) |
Akhmeteev,M.A. et al. Upper Eocene Oligocene spore and pollen, plant macrofossils and phytoplankton in stratotypes of Tchegan and Astsheairyk Formations (North Usturt, Kazakhstan). |
1992 |
| details |
Nd |
|
Nd |
Stover,L.E. et al. Mesozoic-Tertiary dinoflagellates, acritarchs and Prasinophytes. (Principles and Applications. Applications. J.Jansonius and D.C.McGregor, editors.) |
1996 |
| details |
Nd |
|
Nd |
Peniguel,G. et al. Microalgae -their importance in stratigraphy and petroleum exploration. |
1989 |