A landing, followed by observations from a fishing launch, has shown that the Solander Islands are erosional remnants of a maj or volcano consisting of dacitic hornblende-biotite-andesite in the form of lava, tuff, agglomerate, and dykes. Indirect evidence suggests that the rocks are about Upper Pleistocene in age, but more direct evidence might be obtained if ash-showers are found in the sediments of Foveaux Strait and of Stewart Island and the South Island, New Zealand. The volcanism is curiously isolated, the nearest comparable rocks of Tertiary or Quaternary being at Mt. Egmont, 640 miles to the north-north-east. This isolation is a problem of Quaternary tectonics.