Columbia subject headings:
Harvard subject headings:
Geology, Stratigraphic--Cambrian
Geology, Stratigraphic--Proterozoic
Geology--Africa, West.
Geology--Brazil
Gondwana (Continent)
Princeton subject headings:
Geology, Stratigraphic--Cambrian.
Geology, Stratigraphic--Proterozoic.
Geology--Africa, West.
Geology--Brazil.
Gondwana (Continent)