It was discovered by the British National Antarctic Expedition (BrNAE; 1901-04) which named it for Sir Arthur Rucker, Honorary Secretary of the Royal Society.

Named by US-ACAN (1994) after Mark J. Engebretson, upper atmosphere physicist, Augsburg College, an authority in the correlation of Arctic, Antarctic, and spacecraft data.

A prominent summit, 3,730 metres (12,240 ft) high, on Johns Hopkins Ridge, standing 1.7 nautical miles (3.1 km; 2.0 mi) northwest of Mount Rücker.

A high spur descending east from pointed Mount Rücker and forming the divide between Radian and Walcott Glaciers.

Intense and intricate folds interlock like a jigsaw puzzle in the marble wall forming the eastern side of this gully.

A band of extremely hard pyritized shale is exposed in the saddle/pass, and when hit by a hammer the rock gives off a characteristic sulphurous smell.

3,465 metres (11,368 ft) high, standing 3.3 nautical miles (6.1 km; 3.8 mi) south-southwest of Mount Rücker.

A large conical mountain, 3,735 m, surmounting the heads of Allison, Dale, and Potter Glaciers in the Royal Society Range.

Discovered by the British National Antarctic Expedition (BrNAE; 1901-04) which named it for Sir William Huggins, President of the Royal Society, 1900-05.