Brown Bluff is a volcanic structure... John Buchanan January 19, 2019 that erupted beneath a thick glacial ice cover, technically termed a “tuya.” View fullsize (Click image to enlarge.) Descending hikers from a vigorous glacier hike on the south side of Brown Bluff. Kevin Clement, Shirley Metz and yours truly. Shirley is the first woman to ski to the South Pole in 1982.