| details |
Mesozoic |
Tertiary |
USSR |
Chepikov,K.R. et al. Organic remains of older appearance from petroleum of Tertiary Mesozoic and Paleozoic deposits. |
1961 |
| details |
Tertiary |
|
USSR(Ukrainian SSR) |
Chepikov,K.R. New data on microfossils in the crude oils of European USSR. |
1963 |
| details |
Cretaceous |
|
USSR(Kazakh SSR) |
Chepikov,K.R. New data on microfossils in the crude oils of European USSR. |
1963 |
| details |
Tertiary |
|
USSR(Moldavian SSR) |
Chepikov,K.R. New data on microfossils in the crude oils of European USSR. |
1963 |