Lacroix Nunatak () is a ridge of terminal
moraine, about long and high, standing immediately south of a small zone of low rocky ridges which protrude above the ice-covered point southwest of
Cape Margerie, Adélie Coast, Antarctica. It was discovered in 1931 by the British Australian New Zealand Antarctic Research Expedition, and was named by
Mawson after French mineralogist
Alfred Lacroix. It was photographed from the air by U.S. Navy Operation Highjump, 1946–47, and surveyed by the French Antarctic Expedition, 1949–51, which established an astronomical control station near its center.
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