So named by Finn Ronne of the East Base of the United States Antarctic Service ( USAS ) , 1939 -- 41 .
Its peculiar shape was suggestive of that of a sickle .
So named by Finn Ronne of the East Base of the United States Antarctic Service ( USAS ) , 1939 -- 41 , because its peculiar shape was suggestive of that of a sickle .