Columbia subject headings:
Geology, Stratigraphic--Permian--Europe.
Geology, Stratigraphic--Triassic--Europe.
Rifts (Geology)--Europe.
Harvard subject headings:
Geology, Stratigraphic--Permian
Geology, Stratigraphic--Triassic
Rifts (Geology)--Europe.
Princeton subject headings:
Geology, Stratigraphic--Permian.
Geology, Stratigraphic--Triassic.
Rifts (Geology)--Europe.