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. |
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. |