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Nunataks in Antarctica Cântaro Magro, Serra da Estrela, Portugal, formed as a nunatak during the last ice age and now exposed [1]. A nunatak (from Inuit nunataq) is the summit or ridge of a mountain that protrudes from an ice field or glacier that otherwise covers most of the mountain or ridge.
Nunataks, also called glacial islands, are exposed portions of ridges, mountains, or peaks not covered with ice or snow within (or at the edge of) an ice field or glacier. [1] Nunataks present readily identifiable landmark reference points in glaciers or ice caps and are often named. The term is derived from the Inuit word, nunataq.
In biogeography, particularly phytogeography, the nunatak hypothesis about the origin of a biota in formerly glaciated areas is the idea that some or many species have survived the inhospitable period on icefree land such as nunataks. [1]
The rock formations found under the icefields are variable, and rocky mountain peaks known as nunataks tend to jut out from under the surface of icefields. [12] [13] Examples include: Columbia Icefield, Canada; Juneau Icefield, Canada; Southern Patagonian Ice Field, Chile and Argentina; Harding Icefield, Alaska, United States
The Grossman Nunataks are in southwestern Ellsworth Land to the northwest of Merrick Mountains and the southeast of Lyon Nunataks. Features, from northwest to southeast, include Smith Nunataks, Whitmill Nunatak, House Nunatak, Fletcher Nunataks, Barker Nunatak, Zohn Nunataks, Cheeks Nunatak, Fiebelman Nunatak, Schmutzler Nunatak and Gaylord ...
The Seal Nunataks consist of basalt, [2] basalt which contains clinopyroxene, olivine and plagioclase. [16] Andesite and basanite have been reported as well. [17] The rocks define numerous suites, both alkali basalt, subalkaline basalts and basaltic andesites are represented. [18] Xenoliths consisting of lherzolite and spinel have been found at ...
1:250,000 scale topographic map of Outback Nunataks showing the course of the U.S. Victoria Land Traverse party 1959–60. Region to the north Region to the east Region to the south. The terrain to the west of the nunataks is a featureless expanse of the polar plateau. [2] The Emlen Peaks of the Usarp Mountains and the Helliwell Hills are to ...
The Snow Nunataks (or Ashley Snow Nunataks) are a line of four widely separated nunataks on the coast of Palmer Land, Antarctica, trending east–west for 20 mi (32 km) southward of Case Island. [1] They consist of volcanic outcrops that probably represent several small subglacial volcanoes .