It was discovered by the British Australian and New Zealand Antarctic Research Expedition (BANZARE), 1929–31, under Douglas Mawson, who named it for Rt.

The main mass is in the north of the range, rising to a height of about 950 metres (3,120 ft), and extending for about 4 kilometres (2.5 mi).

[6] The geology of the Framnes Mountains as a whole is very similar to that of the Eastern Ghats in India, which lay beside the Mawson Coast before Gondwana broke up.

The mountains are mostly formed of charnockite, a homogeneous brown rock similar to granite that mainly consists of potassium feldspar, quartz and pyroxene.

The charnockite contains pods of the metamorphosed sedimentary rocks as much as 20 kilometres (12 mi) wide, including most of the Casey Range.

Throughout the range there are outcroppings of finely banded rock composed of sillimanite, garnet, pyroxene, quartz and feldspar gneiss.

Garnet is uncommon in the north of the range, but is the main component of the dark bands in parts of Lucas Nunatak.

[3] Download coordinates as: The Forbes Glacier originates on the east of the Casey Range, about 25 kilometres (16 mi) south of the Holme Bay coast.

Tributaries flow east and north through the nunataks of the range, and join into a stream of ice about 5 kilometres (3.1 mi) wide.