Mount Jackson and the Welch Mountains demarcate the central Black Coast, which is dissected by many inlets and is bounded on the west by Dyer Plateau of central Palmer Land. The two mountains rise above the ice shelf with reliefs of about 1,200–1,500 metres (3,900–4,900 ft) towards the east. They are interconnected by icefall zones forming a plateau with steep snow slopes. Mount Jackson rises from its southeast flanks, displaying a steeple summit, whilst the north flank is occupied by a vast cirque. Supraglacial moraines on the mountain's east side measure between 1–5 kilometres (0.62–3.11 mi) in length and display boulders at their distal ends.
The first topographic mapping of Mount Jackson was carried out in November 1940 by a sledge party of the United States Antarctic Service (USAS). The ground survey was facilitated by aerial photographs and aerial observations. The height was estimated at 4,200 metres (13,800 ft), and the mountain was named Mount Ernest Gruening after the Governor of the Alaska Territory at that time, Ernest Gruening.[7] USAS later renamed it Mount Jackson for the seventh President of the United States.[7] President Jackson signed the bill into law authorizing the United States Exploring Expedition of 1838–42. The expedition, led by Lt. Charles Wilkes, included exploration and surveying of the Pacific Ocean and surrounding lands, including Antarctica.[5]
In November 1947, a Falkland Islands Dependencies Survey (FIDS) ground party based at Stonington Island observed Mount Jackson and estimated its height at 3,050 metres (10,010 ft), considerably lower and more accurate than the first estimate in 1940.[7]
After the Falkland Islands Dependencies Survey was renamed British Antarctic Survey in 1962, a series of depots were developed, including one at Mount Jackson.[8] BAS members were successful in making many first ascents of the mountains of the Antarctic Peninsula, and John Cunningham, who served at the BAS base at Adelaide Island, was the first to climb Mount Jackson. Traveling by dog sled for 640 kilometres (400 mi),[9] his team reached the summit on 23 November 1964.[7][6][10]
A precise height of the summit was determined by a BAS survey party who ascended the peak during the austral summer of 1996–97.[1]
Geography
Exposed rock formation on the southern slope of Mount Jackson, showing a mixed mafic/felsicbreccia face
The mountain is 3,184 metres (10,446 ft) in height,[1] with a prominence of 1,384 metres (4,541 ft) and a saddle DEM of 1,901 metres (6,237 ft).[11] Mount Jackson and the Welch Mountains demarcate the central Black Coast, which is dissected by many inlets and is bounded on the west by Dyer Plateau of central Palmer Land, with elevation ranging between 2,000–3,000 metres (6,600–9,800 ft),[12] and on the west side of the central Black Coast.[13] The two mountains rise above the ice shelf with reliefs of about 1,200–1,500 metres (3,900–4,900 ft) towards the east. They are interconnected by icefall zones forming a plateau with steep snow slopes.[14] The northern part of the mountain system, which extends over 1,590 kilometres (990 mi), covers most of the Antarctic Peninsula, and Mount Jackson is its highest peak.[1][15][16]
Mount Jackson rises from its southeast flanks, displaying a steeple summit,[17] whilst the north flank is occupied by a vast cirque. Supraglacial moraines on the mountain's east side measure between 1–5 kilometres (0.62–3.11 mi) in length and display boulders at their distal ends. Mount Jackson and the Rowley Massif are separated by Odom Inlet.[18]Cline Glacier drains eastern Mount Jackson before arriving at Odom Inlet.[19]
Mount Jackson's geology was studied in 1972 as part of the Palmer Island investigations by a team of geologists. They identified various rock types and underlying volcanic activity.[20] The relief of the west facing slopes is gentler when compared to the eastern side, characterized by a steep rocky face. Rock weathering is intense in the area spread with scree and felsenmeer. Fresh rock formations and bedrock disintegration are noted.[14]
^ ab"Antarctica Ultra-Prominences" Peaklist.org. Footnote (14) from site: Elevation from American Alpine Journal (1999). GNIS offers elevation of 3050m. Retrieved 29 January 2013.
^ ab"Mountaineers and Skiers in British Antarctic Territory Place-names"(PDF). Alpine Journal Org. Retrieved 27 December 2012.
Of the many young mountaineers that have served at the BAS stations over the years, space allows mention of only two. J. C. Cunningham (1927–80) … on 23 November 1964 he led the first ascent of Mount Jackson, Palmer Land 3,180 metres (10,430 ft); the highest peak in the BAT.
^"Exploring the Frozen World"(PDF). Mountain World, Climb Magazine.com. Retrieved 15 February 2014.
Ascent of the highest mountain in the entire Peninsula, Mount Jackson at 3,184 metres (10,446 ft) well to the south in remote Palmer Land, fell to the Scot, John Cunningham, in 1964
