Columbia subject headings:
Harvard subject headings:
Geology, Stratigraphic.
Geology--Russia (Federation)--Siberia, Western
Oil fields--Russia (Federation)--Siberia, Western.
Paleoecology--Russia (Federation)--Siberia, Western.
Paleogeography--Russia (Federation)--Siberia, Western.
Princeton subject headings:
Ecology--Russia (Federation)--Siberia.
Geology--Russia (Federation)--Siberia.