Pensacola Mountains
Template:Short description Template:Infobox mountain The Pensacola Mountains (Template:Coord) are a large group of mountain ranges and peaks that extend Template:Convert in a northeast–southwest direction in the Transantarctic Mountains System, Queen Elizabeth Land region of Antarctica. They comprise the Argentina Range, Forrestal Range, Dufek Massif, Cordiner Peaks, Neptune Range, Patuxent Range, Rambo Nunataks and Pecora Escarpment. These mountain units lie astride the extensive Foundation Ice Stream and Support Force Glacier which drain northward to the Ronne Ice Shelf.Template:Sfn
Discovery and namingEdit
The Pensacola Mountains were discovered and photographed on 13 January 1956 in the course of a transcontinental nonstop plane flight by personnel of United States Navy Operation Deep Freeze I from McMurdo Sound to Weddell Sea and return. They were named by the United States Advisory Committee on Antarctic Names (US-ACAN) for the U.S. Naval Air Station, Pensacola, Florida, in commemoration of the historic role of that establishment in training aviators of the United States Navy. The mountains were mapped in detail by United States Geological Survey (USGS) from surveys and United States Navy air photos in 1956–67.Template:Sfn
GeologyEdit
The Pensacola Mountains were originally continuous with the Ventana Mountains near Bahía Blanca in Argentina, Cape Fold Belt in South Africa, the Ellsworth Mountains (West Antarctica) and the Hunter-Bowen orogeny in eastern Australia.
The Ordovician-Devonian Neptune Group rests unconformably on a Cambrian succession, and is overlain disconformably by the Dover Sandstone of the Beacon Supergroup. Within the Neptune Group is the Brown Ridge Conglomerate, Elliott Sandstone, Elbow Formation, and the Heiser Sandstone.Template:Sfn
Western featuresEdit
The Foundation Ice Stream flows through the western part of the range.
- Pecora Escarpment USGS.jpg
Pecora Escarpment, South tip of Patuxent Range
- Thomas Hills USGS.jpg
Patuxent Range. Rambo Nunataks to north
- C83052s5 Schmidt Hills.jpg
North part of Neptune range
- Pecora Escarpment (Template:Coord), an irregular escarpment, Template:Convert long, standing Template:Convert southwest of Patuxent Range and marking the southernmost exposed rocks of the Pensacola Mountains.Template:Sfn
- Patuxent Range (Template:Coord), a major range of the Pensacola Mountains. It comprises the Thomas Hills, Anderson Hills, Mackin Table and various nunataks and ridges bounded by the Foundation Ice Stream, Academy Glacier and the Patuxent Ice Stream.Template:Sfn
- Rambo Nunataks (Template:Coord), a loose chain of nunataks which lie northwest of Patuxent Range and extend along the west side of the Foundation Ice Stream for Template:Convert.Template:Sfn
- Neptune Range (Template:Coord), a mountain range, Template:Convert long, lying west-southwest of Forrestal Range in the central part of the Pensacola Mountains. The range comprises Washington Escarpment with its associated ridges, valleys and peaks, the Iroquois Plateau, the Schmidt Hills and Williams Hills.Template:Sfn
Northern featuresEdit
The northern part of the range is to the south of the Filchner–Ronne Ice Shelf.
- C82052s5 Ant.Map Cordiner Peaks.jpg
Cordiner Peaks, West part of Dufek Massif
- C82045s1 Ant.Map Davis Valley cropped.jpg
East part of Dufek Massif. North part of Forrestal Range
- Saratoga Table USGS.jpg
South part of Forrestal Range
- C82037s5 Ant.Map Argentina Range.jpg
Argentina Range
- Cordiner Peaks (Template:Coord), a group of peaks extending over an area of Template:Convert standing Template:Convert southwest of Dufek Massif in the northern part of the Pensacola Mountains.Template:Sfn
- Dufek Massif (Template:Coord), a rugged, largely snow-covered massif Template:Convert long, standing west of the Forrestal Range in the northern part of the Pensacola Mountains.Template:Sfn
- Forrestal Range (Template:Coord), a largely snow-covered mountain range, about Template:Convert long, standing east of Dufek Massif and the Neptune Range in the Pensacola Mountains.Template:Sfn
- Argentina Range (Template:Coord), a range of rock peaks and bluffs, Template:Convert long, lying Template:Convert east of the northern part of Forrestal Range in the northeastern portion of the Pensacola Mountains.Template:Sfn
ReferencesEdit
SourcesEdit
Further readingEdit
- Gunter Faure, Teresa M. Mensing, The Transantarctic Mountains: Rocks, Ice, Meteorites and Water, P 233
- M.J.Bentley, A.S.Hein, D.E.Sugden, P.L.Whitehouse, R.Shanks, S.Xu, S.P.H.T.Freeman, Deglacial history of the Pensacola Mountains, Antarctica from glacial geomorphology and cosmogenic nuclide surface exposure dating, Quaternary Science Reviews Volume 158, 15 February 2017, Pages 58–76, https://doi.org/10.1016/j.quascirev.2016.09.028
- JOHN C. BEHRENDT, JOHN R. HENDERSON, LAURENT ElSTER, and WILLIAM L. RAMBO, Geophysical Investigations of the Pensacola Mountains and Adjacent Glacierized Areas of Antarctica, GEOLOGICAL SURVEY PROFESSIONAL PAPER 844
- Curtis, M. (2002), Palaeozoic to Mesozoic polyphase deformation of the Patuxent Range, Pensacola Mountains, Antarctica, Antarctic Science, 14(2), 175–183. https://doi:10Template:Dead link.1017/S0954102002000743
- Myrl E. Beck, Palaeomagnetism and Magnetic Polarity Zones in the Jurassic Dufek Intrusion, Pensacola Mountains, Antarctica, Geophysical Journal International, Volume 28, Issue 1, May 1972, Pages 49–63, https://doi.org/10.1111/j.1365-246X.1972.tb06110.x
- Hodgson, Dominic A Bentley, Michael J, Lake highstands in the Pensacola Mountains and Shackleton Range 4300–2250 cal. yr BP: Evidence of a warm climate anomaly in the interior of Antarctica, https://doi.org/10.1177/0959683612460790
- Karolien Peeters (UGent), Dominic A Hodgson, Peter Convey and Anne Willems (UGent), Culturable diversity of heterotrophic bacteria in Forlidas Pond (Pensacola Mountains) and Lundström Lake (Shackleton Range), Antarctica, (2011) MICROBIAL ECOLOGY. 62(2). p. 399-413