Columbia subject headings:
Harvard subject headings:
Paleoecology--Europe.
Paleoecology--Permian
Paleoecology--Triassic
Princeton subject headings:
Basins (Geology)--Europe.
Geology, Stratigraphic--Permian.
Geology, Stratigraphic--Triassic.
Paleoecology--Europe.
Paleogeography--Europe.
Watersheds--Europe.