Columbia subject headings:
Harvard subject headings:
Geological time.
Geology, Stratigraphic--Quaternary
Geology, Stratigraphic--Quaternary--Congresses
Glacial epoch--Congresses.
Paleontology--Quaternary--Congresses.
Princeton subject headings:
Geology, Stratigraphic--Quaternary--Congresses.
Stratigraphic correlation--Congresses.