Portal Rock

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Portal Rock ( 83°50′S165°36′E / 83.833°S 165.600°E / -83.833; 165.600 Coordinates: 83°50′S165°36′E / 83.833°S 165.600°E / -83.833; 165.600 ) is a turret-like rock knob (1,990 m) in Queen Alexandra Range, standing 1.5 nautical miles (2.8 km) northwest of Fairchild Peak, just south of the mouth of Tillite Glacier. So named by the Ohio State University geology party (1966–67) because the only safe route to Tillite Glacier lies between this rock and Fairchild Peak.

Geographic coordinate system Coordinate system

A geographic coordinate system is a coordinate system that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are often chosen such that one of the numbers represents a vertical position and two or three of the numbers represent a horizontal position; alternatively, a geographic position may be expressed in a combined three-dimensional Cartesian vector. A common choice of coordinates is latitude, longitude and elevation. To specify a location on a plane requires a map projection.

Queen Alexandra Range mountain range in Antarctica

The Queen Alexandra Range is a major mountain range of the Transantarctic Mountains System, located in the Ross Dependency region of Antarctica.

Fairchild Peak is a conspicuous rock peak, 2,180 metres (7,150 ft) high, standing 1.6 nautical miles (3 km) south-southeast of Portal Rock, at the south side of the mouth of Tillite Glacier. It was named by the Advisory Committee on Antarctic Names for William W. Fairchild, a United States Antarctic Research Program cosmic ray scientist at McMurdo Sound, 1961.

PD-icon.svg This article incorporates  public domain material from the United States Geological Survey document "Portal Rock" (content from the Geographic Names Information System ).

United States Geological Survey Scientific agency of the United States government

The United States Geological Survey is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization has four major science disciplines, concerning biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility.

Geographic Names Information System geographical database

The Geographic Names Information System (GNIS) is a database that contains name and locative information about more than two million physical and cultural features located throughout the United States of America and its territories. It is a type of gazetteer. GNIS was developed by the United States Geological Survey in cooperation with the United States Board on Geographic Names (BGN) to promote the standardization of feature names.


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Threshold Nunatak 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.

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