[2] The Terra Firma islands are the southernmost point in the world where grass (Deschampsia antarctica) and flowers (Colobanthus quitensis) grow naturally.

[3] On 17 August 1957 personnel from the Argentine San Martín Base on Barry Island established a hut on the west side of Hayrick Island, named "Refugio Granaderos" for the Horse Grenadier Regiment (Regimiento de Granaderos a Caballo) who built it.

[4] The Terra Firma Islands were roughly surveyed by the British Graham Land expedition (BGLE) under John Rymill in 1936.

The largest and southeasternmost of the Terra Firma Islands, with steep rocky cliffs surmounted by a rock and snow cone rising to 320 metres (1,050 ft) high.

Twig Rock was surveyed in 1948 by the FIDS, who so named it because of the branching nature of the dike system exposed on its north face.

[12] This article incorporates public domain material from websites or documents of the United States Geological Survey.