Columbia subject headings:
Geology, Stratigraphic--Paleogene.
Stratigraphic correlation--Europe, Northern.
Stratigraphic correlation--Europe, Western.
Harvard subject headings:
Geology, Stratigraphic--Paleogene
Geology--Europe, Western.
Princeton subject headings:
Geology, Stratigraphic--Paleogene.
Stratigraphic correlation--Europe, Western.