Name StatusOfficial ValidatedFeatureHillNZ Gazette Reference2012 (53) p.1477DatumRSRGD2000GeoTag[1] PositionDescriptionA prominent steeply conical trachyte plug (resmebling Observation Hill at Hut Point) about 466m high, close to the western edge of the Mt Bird ice cap on the south side of Shell Glacier and the north side of Harrison Stream. It is one of a line of linked trachyte plugs trending from Harrison Bluff through Trachyte Hill to the edge of the ice cap. Most distinctive and curious laminar flow structures, forming shells resembling the layers of an onion are developed in the bulbous plugs, and particularly in those between Trachyte Hill and the ice cap. A secondary survey station marked by a rock cairn was placed on the summit of the hill by members of the Cape Bird Party of the NZGSAE, 1958-59, who gave this feature its descriptive name.
