Columbia subject headings:
Geology, Stratigraphic--Paleozoic.
Paleomagnetism.
Plate tectonics.
Harvard subject headings:
Geology, Stratigraphic--Paleozoic
Paleomagnetism
Paleomagnetism--Paleozoic
Plate tectonics.
Princeton subject headings:
Geology, Stratigraphic--Paleozoic.
Paleomagnetism.
Plate tectonics.