Lacroix Nunatak is a ridge of terminal moraine, about 1 nautical mile (1.9 km) long and 75 m high, standing immediately south of a small zone of low rocky ridges which protrude above the ice-covered point 2 nautical miles (3.7 km) southwest of Cape Margerie

Cape Margerie

Cape Margerie is a low, ice-covered cape, marked by prominent rock outcrops at its north end, lying midway between Cape Mousse and Lacroix Nunatak and bounded on the north by numerous rocky islands. Charted by the Australasian Antarctic Expedition under Mawson, 1911–14, who named this feature for...

, Adelie Coast. It was discovered in 1931 by the British Australian New Zealand Antarctic Research Expedition (BANZARE) personnel on the believing it to be a 300-m rock peak

Summit (topography)

In topography, a summit is a point on a surface that is higher in elevation than all points immediately adjacent to it. Mathematically, a summit is a local maximum in elevation...

. It was named by Mawson after French mineralogist Alfred Lacroix, as was Mount Lacroix

Mount Lacroix

Mount Lacroix is a prominent mountain with red vertical cliffs and a rounded summit surmounting the northeast end of Booth Island, in the Wilhelm Archipelago...

. It was photographed from the air by U.S. Navy Operation Highjump, 1946–47, and surveyed by the French Antarctic Expedition

French Antarctic Expedition

French Antarctic Expedition refers to several French expeditions in Antarctica.-First expedition:Yves-Joseph de Kerguelen-Trémarec was a French explorer....

, 1949–51, which established an astronomical control station near its center.