Mount Tilley is a flat-topped, ice-capped

Ice cap

An ice cap is an ice mass that covers less than 50 000 km² of land area . Masses of ice covering more than 50 000 km² are termed an ice sheet....

 mountain

Mountain

Image:Himalaya_annotated.jpg|thumb|right|The Himalayan mountain range with Mount Everestrect 58 14 160 49 Chomo Lonzorect 200 28 335 52 Makalurect 378 24 566 45 Mount Everestrect 188 581 920 656 Tibetan Plateaurect 250 406 340 427 Rong River...

, 1,900 m, 7 nautical miles (13 km) south of Mount Tyrrell

Mount Tyrrell

Mount Tyrrell is a mountain with two summits, the highest 1,310 m, standing 3 nautical miles inland from the east coast of Alexander Island on the east side and near the mouth of Toynbee Glacier. First photographed from the air in 1937 by the British Graham Land Expedition under Rymill...

 and 3 nautical miles (6 km) inland from George VI Sound

George VI Sound

George VI Sound or Canal Jorge VI or Canal Presidente Sarmiento or Canal Seaver or King George VI Sound or King George the Sixth Sound is a major bay/fault depression, 300 miles long in the shape of the letter J, which skirts the east and south shores of Alexander Island, separating it from the...

 in the east part of Alexander Island

Alexander Island

Alexander Island or Alexander I Island or Alexander I Land or Alexander Land is the largest island of Antarctica, with an area of lying in the Bellingshausen Sea west of the base of the Antarctic Peninsula, from which it is separated by Marguerite Bay and George VI Sound. Alexander Island lies off...

. Despite its height, it is best described as a foothill of the Douglas Range

Douglas Range

Douglas Range is a sharp-crested range, with peaks rising to 3,000 metres, extending 120 km in a northwest-southeast direction from Mount Nicholas to Mount Edred and forming a steep east escarpment of Alexander Island within the British Antarctic Territory, overlooking the north part of...

, from which it is separated by Toynbee Glacier

Toynbee Glacier

Toynbee Glacier is a glacier in northeast Alexander Island, 17 nautical miles long and 5 nautical miles wide, between the mountains of the Douglas Range on the west and Mount Tyrrell and Mount Tilley on the east. It flows north from Mount Stephenson to George VI Sound...

. First photographed from the air in 1936 by the British Graham Land Expedition

British Graham Land Expedition

A British expedition to Graham Land led by John Lachlan Cope took place between 1920 and 1922. The British Graham Land Expedition was a geophysical and exploration expedition to Graham Land in Antarctica between 1934 to 1937. Under the leadership of John Riddoch Rymill, the expedition spent two...

 (BGLE). Surveyed in 1948 by the Falkland Islands Dependencies Survey (FIDS) and named by them for Cecil E. Tilley, professor of mineralogy and petrology at Cambridge University.