The break-up of Gondwana
Sills of black dolerite (a basic igneous rock) intruded into buff-coloured Beacon sandstones, Finger Mountain, Victoria Land. These rocks herald the break-up of Gondwana in the Jurassic Period.
Ferrar dolerite dykes intruded into metamorphic rocks of the Ross Orogeny. They are here well exposed along the flanks of Taylor Glacier, Victoria Land. The irregular black patches represent more recent (late Cenozoic) basaltic volcanism.
|Photos Michael Hambrey|