An interpretation of the major structural and volcanic provinces of Antarctica is given in a map, with reference to papers published since the writing of a publication which contains prior citations upon which much of this interpretation is based. Recent data indicate that interior west Antarctica, Marie Byrd Land, and northeastern Victoria Land represent a Paleozoic geosyncline in which sedimentation and orogeny were in general younger than those of the geosyncline of the Transantarctic Mountains.