Threshold Nunatak (83°46′S 166°6′E) is an isolated nunatak located at the mouth of Tillite Glacier, 5 nautical miles (9 km) northeast of Portal Rock, in Queen Alexandra Range. The name was suggested by John Gunner of the Ohio State University Geological Expedition, 1969–70, who was landed by helicopter to collect a rock sample here. The name is in association with Portal Rock and also reflects the location at the mouth of Tillite Glacier.
This article incorporates public domain material from the United States Geological Survey document "Threshold Nunatak" (content from the Geographic Names Information System).
References
Threshold Nunatak Wikipedia(Text) CC BY-SA