Abstract This work presents research that we intended to publish jointly with Maarten de Wit on the importance of Hans Keidel in the definition of the Gondwanides and in his pioneering proposal of correlation between the Sierras de la Ventana mountain system in the province of Buenos Aires, Argentina, and its counterpart in the Cape System in South Africa. Keidel's proposals were used by Wegener in the 1920 second edition of his ‘Theory on Continental Drift’. Keidel's role and his ideas of correlation were recognized and strengthened by du Toit's fieldwork in 1923 in the Sierras de la Ventana and which he left behind in his field notebook. Du Toit has the credit of being the first to carry out fieldwork on both continents. His observations and his precise correlations confirmed Keidel's hypotheses through his 1927 publication and his book on the Wandering Continents. It is noteworthy that after Wegener's death in 1930, du Toit defended the Theory of Continental Drift for years almost alone. The work is documented with photographs from du Toit's trip to South America, the originals of which have been lost in the devastating 2021 fire at the Jagger Library at the University of Cape Town.

Abstract Following more than 25 years of exploration and research since the last regional appraisal, the number of known subaerially exposed volcanoes in the northern Antarctic Peninsula region has more than trebled, from less than 15 to more than 50, and that total must be increased at least three-fold if seamounts in Bransfield Strait are included. Several volcanoes remain unvisited and there are relatively few detailed studies. The region includes Deception Island, the most prolific active volcano in Antarctica, and Mount Haddington, the largest volcano in Antarctica. The tectonic environment of the volcanism is more variable than elsewhere in Antarctica. Most of the volcanism is related to subduction. It includes very young ensialic marginal basin volcanism (Bransfield Strait), back-arc alkaline volcanism (James Ross Island Volcanic Group) and slab-window-related volcanism (seamount offshore of Anvers Island), as well as volcanism of uncertain origin (Anvers and Brabant islands; small volcanic centres on Livingston and Greenwich islands). Only ‘normal’ arc volcanism is not clearly represented, possibly because active subduction virtually ceased at c. 4 Ma. The eruptive environment for the volcanism varied between subglacial, marine and subaerial but a subglacial setting is prominent, particularly in the James Ross Island Volcanic Group.