scholarly journals Glaciation on the Arctic Slope of the Brooks Range, Northern Alaska

ARCTIC ◽  
1958 ◽  
Vol 11 (1) ◽  
pp. 43 ◽  
Author(s):  
R.L. Detterman ◽  
A.L. Bowsher ◽  
J. Thomas Dutro, Jr.
Keyword(s):  
The Arctic ◽  
Glacial History ◽  
Glacial Deposits ◽  
Brooks Range ◽  
History Of ◽  
Chronological Sequence ◽  
Northern Alaska

Reconstructs glacial history of the area (approx. 68-69 30 N, 147-162 W) on the basis of observations during 1944-1953 of the nature and extent of glacial deposits in the central part of the Range between Shainin and Itkillik Lakes and in the southern part of the Foothills Province from the Shaviovik River west to Etivluk River. Distribution is mapped and characteristics described of deposits from six glaciations for which a tentative chronological sequence is established: Anaktuvuk and Sagavanirktok of Pre-Wisconsin age; Itkillik and Echooka of Early Wisonsin; Alapah Mountain of Late Wisconsin; and Fan Mountain of Recent age. Terrace deposits and Pleistone alluviations are mentioned.

The Glacial History of the Svalberd Archipelago from Late Vistulian to the Present Time / Historia zlodowacenia archipelagu Svalbard od późnego vistulianu do współczesności

2014 ◽  
Vol 69 (2) ◽  
Author(s):  
Joanna Ćwiąkała ◽  
Mateusz Moskalik ◽  
Jan Rodzik ◽  
Piotr Zagórski
Keyword(s):  
Continental Shelf ◽  
20Th Century ◽  
Ice Sheet ◽  
Ice Age ◽  
The Arctic ◽  
Glacial History ◽  
Svalbard Archipelago ◽  
Maximum Extent ◽  
Late Vistulian ◽  
History Of

AbstractThe glacial history of the Svalbard archipelago is often a hot topic for researches, but the articles usually refer to a particular piece of Svalbard. The authors of this work studied many scientific articles based on the researches to find and collect this history. Svalbard archipelago is located in the Arctic, at the edge of the continental shelf of Europe. The end of shelf boundary noted occurrence of ice caps in the past glaciations. In turn, the main elements of the landscape of the archipelago are glaciers that are currently in a recession. Spitsbergen (the biggest island of the archipelago) sets the limit of Pleistocene glaciations, and the current state of glaciers allows determining the place where the recession is intense. The main aim of the authors in this study is to show this history only from the late Vistulian to the late Holocene (the beginning of 21st century). Interstadials and Stadials start time varies, as their duration in different places, according to various authors. It is very hard to collect all information and describe this history. By knowing the history of glaciation, we can distinguish in the late Vistulian: Last Glacial Maximum (LGM), Bølling/Older Dryas/Allerød and Younger Dryas (YD). LGM was the stadial in which was the maximum extent of ice sheet in late Vistulian. After this period, ice sheet began to retreat from the continental shelf. In turn, YD was the stadial in which the last advance of glaciers took place, about 11 000 years BC. In the Holocene we can distinguish Holocene Climatic Optimum (in the meantime short Cooling Holocene), Revdalen Stadial, Medieval Warm Period, Little Ice Age (LIA) and 20th century warming. The maximum extent of glaciers in Holocene was in LIA. In LIA, the extent of glaciers was bigger than in YD. In 20th century a warming started and continues until now.

A new species of Droharhynchia (Brachiopoda) from the lower Middle Devonian (Eifelian) of west-central Alaska

1994 ◽  
Vol 68 (6) ◽  
pp. 1235-1240 ◽  
Author(s):  
Mary E. Baxter ◽  
Robert B. Blodgett
Keyword(s):  
New Species ◽  
Middle Devonian ◽  
The Arctic ◽  
Geographic Proximity ◽  
Brooks Range ◽  
West Central ◽  
Arctic Alaska ◽  
Northern Alaska ◽  
A New Species

A new species of the genus Droharhynchia Sartenaer is established from lower Eifelian strata of west-central Alaska and the northwestern Brooks Range of Alaska. Droharhynchia rzhonsnitskayae n. sp. occurs in the Cheeneetnuk Limestone of the McGrath A-5 quadrangle, west-central Alaska, and the Baird Group of the Howard Pass B-5 quadrangle, northwestern Alaska. These occurrences extend the lower biostratigraphic range of both the genus and the subfamily Hadrorhynchiinae into the Eifelian. They also suggest close geographic proximity of the Farewell terrane of southwestern and west-central Alaska and the Arctic Alaska superterrane of northern Alaska during Devonian time.

scholarly journals Relationship of Permafrost Cryofacies to Varying Surface and Subsurface Terrain Conditions in the Brooks Range and foothills of Northern Alaska, USA

2016 ◽  
Author(s):  
Andrew W. Balser ◽  
Jeremy B. Jones ◽  
M. Torre Jorgenson
Keyword(s):  
Regional Scale ◽  
The Arctic ◽  
Field Sampling ◽  
Multiple Factor Analysis ◽  
Brooks Range ◽  
Local Ecology ◽  
Northern Alaska ◽  
Relationship Of ◽  
State Factor ◽  
Multiple Factor

Abstract. Permafrost landscape responses to climate change and disturbance impact local ecology and global greenhouse gas concentrations, but the nature and magnitude of response is linked with vegetation, terrain and permafrost properties that vary markedly across landscapes. As a subsurface property, permafrost conditions are difficult to characterize across landscapes, and modeled estimates rely upon relationships among permafrost characteristics and surface properties. While a general relationship among landscape and permafrost properties has been recognized throughout the Arctic, the nature of these relationships is poorly documented in many regions, limiting modeling capability. We examined relationships among terrain, vegetation and permafrost within the Brooks Range and foothills of northern Alaska using field data from diverse sites and multiple factor analysis ordination. Terrain, vegetation and permafrost conditions were correlated throughout the region, with field sites falling into four statistically-separable groups based on ordination results. Our results identify index variables for honing field sampling and statistical analysis, illustrate the nature of relationships in the region, support future modeling of permafrost properties, and suggest a state factor approach for organizing data and ideas relevant for modeling of permafrost properties at a regional scale.

Notes on Two Archaeological Discoveries in Northern Alaska, 1950

1951 ◽  
Vol 17 (1Part1) ◽  
pp. 55-57 ◽  
Author(s):  
Ralph S. Solecki
Keyword(s):  
North America ◽  
Geological Survey ◽  
The Arctic ◽  
Brooks Range ◽  
Arctic Circle ◽  
Northern Side ◽  
The University ◽  
Northern Alaska ◽  
Mountain Province ◽  
The U.S

Several significant pre-Eskimo finds related to early aboriginal occupations in North America were made north of the Arctic Circle during the 1950 season in Alaska. These discoveries were made within and just bordering the northern side of the Brooks Range mountain province. Two of the more important finds were made by Milton C. Lachenbruch and Robert J. Hackman of the U.S. Geological Survey. Another important find was made by Irving, a student at the University of Alaska (Giddings, 1950, p. 20). Lachenbruch's and Hackman's specimens were submitted to the writer for study and are described summarily in this paper. It is reported that Irving found lithic cultural remains similar to those found by Hackman not far from the latter's station near Anaktuvuk Pass.

scholarly journals Recent Glacial History of an Alpine Area in the Colorado Front Range, U.S.A.: II. Dating the Glacial Deposits

1968 ◽  
Vol 7 (49) ◽  
pp. 77-87 ◽  
Author(s):  
James B. Benedict
Keyword(s):  
Local Development ◽  
Colorado Front Range ◽  
Front Range ◽  
Glacial History ◽  
Glacial Deposits ◽  
Radiocarbon Dates ◽  
The Past ◽  
Rhizocarpon Geographicum ◽  
History Of ◽  
Mountain Glaciation

AbstractRecent glacial deposits in the Indian Peaks area of the Colorado Front Range have been dated lichenometricaily, using a growth curve developed locally forRhizocarpon geographicum. Radiocarbon dates, where available, tend to support the lichen chronology. Three distinct intervals of glaciation, each consisting of several minor pulsations, have occurred in the area during the past 4500 years. The earliest advance (Temple Lake Stade) is dated at 2500–700 b.c. A later advance (Arikaree Stade) began in about a.d. 100 and ended in a.d. 1000. The most recent advance (Gannett Peak Stade) is dated at a.d. 1650–1850. It remains to be seen whether the Arikaree Stade was purely a local development or whether glaciers were advancing elsewhere in the cordilleran region during this interval. Alluviation on the plains east of the Colorado Front Range seems to have occurred during the waning stages of mountain glaciation.

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