The Scotia arc, originally called the Southern Antilles, is the elongated loop of islands and shallow banks that extends 1,500 miles eastward in the south Atlantic from Tierra del Fuego and Graham Land peninsula. The known geology of the islands is reviewed, and a comparative stratigraphic table compiled. The presence of thick geosynclinal deposits and granite intrusions near South Georgia and a highly metamorphosed basement complex in the South Orkneys are among the features that distinguish the islands from other oceanic islands. It is concluded that they probably represent areas with a continental-type crustal structure.

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