Penck Ledge

Last updated May 01, 2019

Penck Ledge ( 73°3′S4°18′W / 73.050°S 4.300°W / -73.050; -4.300 Coordinates: 73°3′S4°18′W / 73.050°S 4.300°W / -73.050; -4.300 ) is a mainly ice-covered ledge at the west side of the head of Penck Trough in Queen Maud Land. Mapped by Norwegian cartographers from surveys and air photos by the Norwegian-British-Swedish Antarctic Expedition (NBSAE) (1949–1952), led by John Schjelderup Giæver, and additional air photos (1958–59), and named in association with Penck Trough.

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Penck Trough is a broad ice-filled valley trending southwest to northeast, for about 100 km (62 mi) between Borg Massif and the northeast part of Kirwan Escarpment, in Queen Maud Land. It was discovered by the Third German Antarctic Expedition (1938–1939), led by Capt. Alfred Ritscher, and named for German geographer Albrecht Penck. Maps of the German Antarctic Expedition incorrectly represent this feature with a north-south axis, but it was accurately mapped by the Norwegian-British-Swedish Antarctic Expedition (NBSAE) (1949–1952), led by John Schjelderup Giæver.

Queen Maud Land is a c. 2.7 million square kilometre (1.04 million sq mi) region of Antarctica claimed as a dependent territory by Norway. The territory lies between 20° west and 45° east, between the claimed British Antarctic Territory to the west and the similarly claimed Australian Antarctic Territory to the east. On most maps there had been an unclaimed area between Queen Maud Land's borders of 1939 and the South Pole until 12 June 2015 when Norway formally annexed that area. Positioned in East Antarctica, the territory comprises about one-fifth of the total area of Antarctica. The claim is named after the Norwegian queen Maud of Wales (1869–1938).

This article incorporates public domain material from the United States Geological Survey document "Penck Ledge" (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.

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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The Kirwan Escarpment is a prominent northwest-facing escarpment which lies south of the Penck Trough in Queen Maud Land, Antarctica. The escarpment is featured by moderate-height cliffs and prominent rock spurs interspersed with glaciers and steep ice slopes and trends northeast–southwest for about 90 nautical miles (170 km). At least the northern end of this feature was included in the aerial photography of the general area by the Third German Antarctic Expedition (1938–39), but the maps resulting from that expedition do not portray the escarpment properly. The escarpment was mapped by Norwegian cartographers from surveys and air photos (1958–59) and named for Laurence P. Kirwan, Director of the Royal Geographical Society.

Mount Adkins is a mountain surmounting the north flank of Mosby Glacier just west of the mouth of Fenton Glacier in Palmer Land. Mapped by United States Geological Survey (USGS) from ground surveys and U.S. Navy air photos, 1961–67. Named by Advisory Committee on Antarctic Names (US-ACAN) for Thomas Adkins, cook with the Palmer Station winter party in 1965.

Borg Massif is a mountain massif, about 50 km (30 mi) long and with summits above 2,700 metres (8,900 ft), situated along the northwest side of the Penck Trough in Queen Maud Land, East Antarctica. The tallest peak, at 2,727 metres (8,947 ft), is Hogsaetet Mountain. The parallel, ice-filled Raudberg Valley and Frostlendet Valley trend northeastward through the massif, dividing its summits into three rough groups:

Located at the northern end of the Borg Massif is the summit of Borg Mountain, a large, flattish, ice-topped mountain with many exposed rock cliffs.
Located at the northeastern end of the Borg Massif is the summit of Ytstenut Peak. The name "Ytstenut" means "outermost peak" in the Norwegian language.
Located at the southern end of the Borg Massif is the summit of Hogfonna Mountain. The name "Hogfonna" means "the high snowfield" in the Norwegian language.

Ryan Glacier is a glacier, 2 nautical miles long, flowing west to the head of Ice Fjord, South Georgia. The German Antarctic Expedition (1911-12) named this glacier for Dr. Albrecht Penck, though an incorrect spelling "Penk" appeared on published maps. A number of significant Antarctic features, including a glacier, are named for Albrecht Penck. To avoid confusion of these names the United Kingdom Antarctic Place-Names Committee (UK-APC) recommended in 1957 that this feature be renamed. Ryan Glacier is named for Alfredo R.L. Ryan, president since 1946 of the Compañía Argentina de Pesca, which operated the whaling station at Grytviken.

Båkenesdokka Valley is an ice-filled valley at the east side of Roberts Knoll, draining north to Jelbart Ice Shelf in Queen Maud Land. It was mapped by Norwegian cartographers from surveys and from air photos by the Norwegian-British-Swedish Antarctic Expedition (1949–52) and named "Båkenesdokka".

Utrinden Point is a rock point at the northwest side of Kuven Hill, near the southwest end of the Kirwan Escarpment in Queen Maud Land. Mapped by Norwegian cartographers from surveys and air photos by NGSAE (1949–52) and additional air photos (1958–59), and named Utrinden.

Oberst Glacier is a glacier draining the west side of Balchen Mountain in the Sor Rondane Mountains. Mapped by Norwegian cartographers in 1957 from air photos taken by U.S. Navy Operation Highjump, 1946–47, and named Oberstbreen because of its association with Balchen Mountain. Bernt Balchen, a famous Norwegian polar aviator, achieved the rank of colonel in the U.S. Army Air Force in World War II.

Nalegga Ridge is a narrow rock ridge marking the north end of Seilkopf Peaks in the Borg Massif, Queen Maud Land. Mapped by Norwegian cartographers from surveys and air photos by Norwegian-British-Swedish Antarctic Expedition (NBSAE) (1949–52) and named Nalegga.

Kvervelnatten Peak is a peak 2 nautical miles (4 km) southwest of Svartbandufsa Bluff in the Kirwan Escarpment of Queen Maud Land, Antarctica. It was mapped and named by Norwegian cartographers from surveys and air photos by the Norwegian–British–Swedish Antarctic Expedition (1949–52) and additional air photos (1958–59).

Koms Glacier is a glacier, 5 nautical miles (9 km) long, flowing north between Mefjell Mountain and Komsa Mountain in the Sør Rondane Mountains of Antarctica. It was mapped by Norwegian cartographers in 1957 from air photos taken by U.S. Navy Operation Highjump, 1946–47, and named Komsbreen.

Storkletten Peak is an ice-free mountain 1 nautical mile (1.9 km) south of Flarjuven Bluff on the Ahlmann Ridge in Queen Maud Land, Antarctica. It was mapped by Norwegian cartographers from surveys and air photos by Norwegian-British-Swedish Antarctic Expedition (NBSAE) (1949–52) and named Storkletten, meaning the big, steep mountain.

Tverregg Glacier is a glacier between Heksegryta Peaks and Tverregga Spur in the Kirwan Escarpment, Queen Maud Land. Mapped by Norwegian cartographers from surveys and air photos by Norwegian-British-Swedish Antarctic Expedition (NBSAE) (1949–52) and additional air photos (1958–59), and named Tverreggbreen.

The Grunehogna Peaks are a group of peaks 2 nautical miles (4 km) north of the Liljequist Heights, in the south part of Ahlmann Ridge in Queen Maud Land, Antarctica. They were photographed from the air by the Third German Antarctic Expedition (1938–39). They were mapped by Norwegian cartographers from surveys and air photos by the Norwegian–British–Swedish Antarctic Expedition (1949–52) and the Norwegian expedition (1958–59) and named Grunehogna.

Peter Glacier is a short, broad glacier draining northeast into Jutulstraumen Glacier just east of Neumayer Cliffs and Melleby Peak in Queen Maud Land. Mapped by Norwegian cartographers from surveys and air photos by Norwegian-British-Swedish Antarctic Expedition (NBSAE) (1949–52) and air photos by the Norwegian expedition (1958–59). Named for Peter Melleby who was in charge of sledge dogs with the NBSAE.

Fenton Glacier is a glacier that drains south into Mosby Glacier just east of Mount Adkins in Palmer Land, Antarctica. It was mapped by the United States Geological Survey from ground surveys and U.S. Navy air photos, 1961–67, and was named by the Advisory Committee on Antarctic Names for Lieutenant Ernest R. Fenton, U.S. Navy, Officer-in-Charge of Palmer Station in 1971.

Gavlpiggen Peak is a low, isolated peak 2 nautical miles (4 km) southwest of Klakknabben Peak, just north of the Kirwan Escarpment in Queen Maud Land, Antarctica. It was mapped by Norwegian cartographers from surveys and air photos by the Norwegian–British–Swedish Antarctic Expedition (1949–52) and from additional air photos (1958–59), and named Gavlpiggen.

Midbresrabben Hill is an isolated rock hill protruding above the ice between Penck Trough and Jutulstraumen Glacier, east of the Borg Massif in Queen Maud Land, Antarctica. It was mapped by Norwegian cartographers from surveys and air photos by the Norwegian–British–Swedish Antarctic Expedition (1949–52) and from air photos by the Norwegian expedition (1958–59) and named "Midbresrabben".

Mount Hochlin is a large ice-topped mountain, 2,760 metres (9,060 ft) high, standing east of Festninga Mountain in the Mühlig-Hofmann Mountains of Queen Maud Land, Antarctica. It was mapped by Norwegian cartographers from surveys and air photos by the Sixth Norwegian Antarctic Expedition (1956–60) and named for L. Hochlin, a radio operator and dog driver with the expedition (1956–58).