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Hiking up the Marr Ice Piedmont above Palmer Station, 3 Dec 2009. This glacier completely covers Anvers Island and is 600 m thick at its center. It is named for the British marine biologist (W. S. Marr) who accompanied Mawson and Shackleton on Antarctic expeditions. The ice front has been retreating since at least 1965 at a rate of 10 m/year.