. Die Baumreste – darunter einzelne, etwa 50 cm hohe und einen Meter dicke Mammutbaumstümpfe (Metasequoia glyptostroboides) – waren nicht wie gewöhnlich versteinert (petrifiziert), sondern mumifiziert (also brennbar); das Holz war zwar dem Druck von Sedimenten ausgesetzt gewesen, doch wurden die gewachsenen Zellstrukturen nur wenig verändert und nicht wie bei Versteinerungsprozessen mit Mineralsalzen durchtränkt. Axel Heiberg Island (Inuktitut: á á¥ááªá¦ ááá¦, Umingmat Nunaat) is an uninhabited island in the Qikiqtaaluk Region, Nunavut, Canada. One of the larger members of the Canadian Arctic Archipelago, it is also a member of the Sverdrup Islands and Queen Elizabeth Islands. It currently has no official status, in part because land claims had to be settled. Instead of turning into petrified "stone" fossils, they were ultimately mummified by the cold, dry Arctic climate, and only recently exposed by erosion. This resulted in the establishment of the McGill Arctic Research Station (79°26â²N 90°46â²W / 79.433°N 90.767°W / 79.433; -90.767 (McGill Arctic Research Station)), constructed 8 km (5.0 mi) inland from Expedition Fjord in 1960. He named it after Axel Heiberg, financial director of the Norwegian Ringnes brewery which sponsored the expedition. The rest of the island is mostly covered by bare ground, as there is little vegetation. Erläuterung Übersetzung Axel Heiberg Island. The trees reached up to 35 m (110 ft) in height; some may have grown for 500 to 1,000 years. Roughly 35 per cent of the island is covered permanently by ice, including two main ice caps (the Müller and Stacie ice caps) as well as other glacier types (e.g., valley glaciers). Axel Heiberg Island is located in the Arctic Ocean (Nunavut, Canada). The McGill Arctic Research Station is active from March to August with research currently focused on polar geomorphology, geology, glaciology, permafrost, climate change, and polar microbiology. As the trees fell, the fine sediment in which the forest grew protected the plants. ", NRCan.geogratis-geogratis.RNCan@canada.ca, http://ftp.geogratis.gc.ca/pub/nrcan_rncan/raster/atlas/eng/glacier/higharcticislands/plate4-0.jpg, http://ftp.geogratis.gc.ca/pub/nrcan_rncan/raster/atlas/eng/glacier/higharcticislands/plate4-0.pdf. The island is uninhabited except for the seasonal McGill Arctic Research Station operated by McGill University. The stumps have since been dated at more than 45 million years old, evidence that the Far North was at that time much warmer and wetter. It has a total area of 43178 km2 (16671 mi2), ranking it the world's 31st largest and Canada's 7th largest island. The Princess Margaret Range dominates the island’s topography, and its highest mountain, Outlook Peak, is 2,210 m. The perimeter of the island is made up of three bays (Whitsunday, Sand and Good Friday bays) and multiple fjords (Expedition, Strand, Li, Middle, Skaare, Wolf and Glacier fjords). [2] Owing to the lack of mineralization in many of the forest specimens, the traditional characterization of "fossilisation" fails for these forests and "mummification" may be a clearer description. ", "On the thermal regime of an arctic valley glacier: a study of White Glacier, Axel Heiberg Island, N.W.T., Canada", "Mass balance of White Glacier, Axel Heiberg Island, N.W.T., Canada, 1960-91", "New Species of Picea A. Dietrich (Pinaceae) from the Middle Eocene of Axel Heiberg Island, Arctic Canada", 10.1657/1523-0430(2006)38[216:abvpia]2.0.co;2, Arctic Redwood Fossils Are Clues to Ancient Climates, Chih-Ying Lay, Nadia C. S. Mykytczuk, Ãtienne Yergeau, Guillaume Lamarche-Gagnon, Charles W. Greer, & Lyle G. Whyte, "Defining the Functional Potential and Active Community Members of a Sediment Microbial Community in a High-Arctic Hypersaline Subzero Spring,". types (e.g., valley glaciers). Although publication of this map series was suspended in the mid-seventies and gaps remain to be filled for some coverage areas, what has been created for this series thus far should prove useful in some aspects of glacier research. 1996a; Cogley and Adams 2000). Continuous gas emissions from the spring indicate an underlying thermogenic methane source.
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