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NORSK GEOLOGISK TIDSSKRIFT 45 by IVAR KLOVNING and ULF
NORSK GEOLOGISK TIDSSKRIFT 45 AN EARLY POST-GLACIAL POLLEN PROFILE FROM FLÅMSDALEN, A TRIBUTARY VALLEY TO THE SOGNEFJORD, WESTERN NORWAY BY IVAR KLOVNING and ULF HAFSTEN (University Botanical Museum, Bergen) Abstract. Pollen analysis and radiocarbon measurements of nekron-mud from the base of a 5 m deep organic deposit in a pot-hole on Furuberget, a rocky promontory in the lower part of the Flåmsdalen valley, show that this part of the valley was free of ice befare 7000 B.C. Introduction Flåmsdalen, a 20 km long, much glaciated tributary valley to the Sognefjord, cutting southwards into the peripheral parts of the Har dangervidda plateau, contains a number of erosional features from the time the ice retreated from this valley (H. HoLTEDAHL 1960). Among these is a series of sharply incised, mostly very narrow canyons of different sizes and shapes, often fringed with pot-hoies. The canyons form a system, with a major canyon, present in parts of the main valley, forming the river channel of the present river and a series of tributary canyons which are mostly dry at the present time. These tributary canyons, which are supposed to be sub-glacial erosional phenomena, are very numerous on and around Furuberget, a broad and steep, rocky promontory (riegel), nearly 200m high, that almost doses the Flåmsdalen valley 5 km south of the head of the Aurland fjord (Fig. 1). The fact that the river here, at this typical valley step, has cut a deep canyon, indicates that the valley once was com pletely closed at this place. The most extensive canyon occurring on Furuberget runs in an are from southwest to east across the central part of the promontory and contains a series of pot-hales that are, especially in the flat, eastern part of the canyon, completely filled with organic matter (KLOVNING 1963). -
Glacial Cirques As Palaeoenvironmental Indicators: Their Potential and Limitations
Glacial cirques as palaeoenvironmental indicators: their potential and limitations Barr, I. D., & Spagnolo, M. (2015). Glacial cirques as palaeoenvironmental indicators: their potential and limitations. Earth-Science Reviews, 151, 48-78. https://doi.org/10.1016/j.earscirev.2015.10.004 Published in: Earth-Science Reviews Document Version: Peer reviewed version Queen's University Belfast - Research Portal: Link to publication record in Queen's University Belfast Research Portal Publisher rights ©2015 Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc- nd/4.0/ which permits distribution and reproduction for non-commercial purposes, provided the author and source are cited. General rights Copyright for the publications made accessible via the Queen's University Belfast Research Portal is retained by the author(s) and / or other copyright owners and it is a condition of accessing these publications that users recognise and abide by the legal requirements associated with these rights. Take down policy The Research Portal is Queen's institutional repository that provides access to Queen's research output. Every effort has been made to ensure that content in the Research Portal does not infringe any person's rights, or applicable UK laws. If you discover content in the Research Portal that you believe breaches copyright or violates any law, please contact [email protected]. Download date:24. Sep. 2021 Glacial cirques as palaeoenvironmental indicators: their potential and limitations Iestyn D. Barr (Corresponding author) School of Geography, Archaeology and Palaeoecology, Queen’s University Belfast, BT7 1NN, Belfast, UK Email: [email protected] Tel: +44 (0)28 9097 5146 Matteo Spagnolo School of Geosciences, University of Aberdeen, Elphinstone Road, AB243UF, Aberdeen, UK Abstract Glacial cirques are armchair-shaped erosional hollows, typified by steep headwalls and, often, overdeepened floors. -
November 1960 I Believe That the Major Exports of Antarctica Are Scientific Data
JIET L S. Antarctic Projects OfficerI November 1960 I believe that the major exports of Antarctica are scientific data. Certainly that is true now and I think it will be true for a long time and I think these data may turn out to be of vastly, more value to all mankind than all of the mineral riches of the continent and the life of the seas that surround it. The Polar Regions in Their Relation to Human Affairs, by Laurence M. Gould (Bow- man Memorial Lectures, Series Four), The American Geographiql Society, New York, 1958 page 29.. I ITOJ TJM II IU1viBEt 3 IToveber 1960 CONTENTS 1 The First Month 1 Air Operations 2 Ship Oper&tions 3 Project MAGNET NAF McMurdo Sounds October Weather 4 4 DEEP FREEZE 62 Volunteers Solicited A DAY AT TEE SOUTH POLE STATION, by Paul A Siple 5 in Antarctica 8 International Cooperation 8 Foreign Observer Exchange Program 9 Scientific Exchange Program NavyPrograrn 9 Argentine Navy-U.S. Station Cooperation 9 10 Other Programs 10 Worlds Largest Aircraft in Antarctic Operation 11 ANTARCTICA, by Emil Schulthess The Antarctic Treaty 11 11 USNS PRIVATE FRANIC 3. FETRARCA (TAK-250) 1961 Scientific Leaders 12 NAAF Little Rockford Reopened 13 13 First Flight to Hallett Station 14 Simmer Operations Begin at South Pole First DEEP FREEZE 61 Airdrop 14 15 DEEP FREEZE 61 Cargo Antarctic Real Estate 15 Antarctic Chronology,. 1960-61 16 The 'AuuOiA vises to t):iank Di * ?a]. A, Siple for his artj.ole Wh.4b begins n page 5 Matera1 for other sections of bhis issue was drawn from radio messages and fran information provided bY the DepBr1nozrt of State the Nat0na1 Academy , of Soienoes the NatgnA1 Science Fouxidation the Office 6f NAval Re- search, and the U, 3, Navy Hydziograpbio Offioe, Tiis, issue of tie 3n oovers: i16, aótivitiès o events 11 Novóiber The of the Uxitéd States. -
Flow and Structure in a Dendritic Glacier with Bedrock Steps
Journal of Glaciology (2017), 63(241) 912–928 doi: 10.1017/jog.2017.58 © The Author(s) 2017. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons. org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. Flow and structure in a dendritic glacier with bedrock steps HESTER JISKOOT,1 THOMAS A FOX,1 WESLEY VAN WYCHEN1,2 1Department of Geography, University of Lethbridge, Lethbridge, AB, Canada 2Department of Geography, Environment and Geomatics, University of Ottawa, Ottawa, ON, Canada Correspondence: Hester Jiskoot <[email protected]> ABSTRACT. We analyse ice flow and structural glaciology of Shackleton Glacier, a dendritic glacier with multiple icefalls in the Canadian Rockies. A major tributary-trunk junction allows us to investigate the potential of tributaries to alter trunk flow and structure, and the formation of bedrock steps at con- fluences. Multi-year velocity-stake data and structural glaciology up-glacier from the junction were assimilated with glacier-wide velocity derived from Radarsat-2 speckle tracking. Maximum flow − − speeds are 65 m a 1 in the trunk and 175 m a 1 in icefalls. Field and remote-sensing velocities are in good agreement, except where velocity gradients are high. Although compression occurs in the trunk up-glacier of the tributary entrance, glacier flux is steady state because flow speed increases at the junc- tion due to the funnelling of trunk ice towards an icefall related to a bedrock step. Drawing on a pub- lished erosion model, we relate the heights of the step and the hanging valley to the relative fluxes of the tributary and trunk. -
Flow and Structure in a Dendritic Glacier with Bedrock Steps
Journal of Glaciology (2017), 63(241) 912–928 doi: 10.1017/jog.2017.58 © The Author(s) 2017. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons. org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. Flow and structure in a dendritic glacier with bedrock steps HESTER JISKOOT,1 THOMAS A FOX,1 WESLEY VAN WYCHEN1,2 1Department of Geography, University of Lethbridge, Lethbridge, AB, Canada 2Department of Geography, Environment and Geomatics, University of Ottawa, Ottawa, ON, Canada Correspondence: Hester Jiskoot <[email protected]> ABSTRACT. We analyse ice flow and structural glaciology of Shackleton Glacier, a dendritic glacier with multiple icefalls in the Canadian Rockies. A major tributary-trunk junction allows us to investigate the potential of tributaries to alter trunk flow and structure, and the formation of bedrock steps at con- fluences. Multi-year velocity-stake data and structural glaciology up-glacier from the junction were assimilated with glacier-wide velocity derived from Radarsat-2 speckle tracking. Maximum flow − − speeds are 65 m a 1 in the trunk and 175 m a 1 in icefalls. Field and remote-sensing velocities are in good agreement, except where velocity gradients are high. Although compression occurs in the trunk up-glacier of the tributary entrance, glacier flux is steady state because flow speed increases at the junc- tion due to the funnelling of trunk ice towards an icefall related to a bedrock step. Drawing on a pub- lished erosion model, we relate the heights of the step and the hanging valley to the relative fluxes of the tributary and trunk. -
Bericht 2010 Über Geologische Aufnahmen Der Quartären
Bericht 2010 shed ridge at the head of the valley, in the vicinity of the über geologische Aufnahmen Mölsjoch pass (2330 m), where glacially moulded phyllites der quartären Sedimente im Bereich are evident. 120 m to the east of this pass, a frost-weath- Mölstal, Wattener Lizum, Klammalm, ered bedrock crest is preserved at a level of 2360 m, and Tarntäler, Navisbach, Junsbach 250 m north of the Mölsjoch pass there is evidence of a palaeonunatak of carbonate rocks, with a frost-weathered und Madseitbach summit (ca. 2330 m) surrounded by polished bedrock sur- auf Blatt 2223 Innsbruck faces with glacial karst features. An occurrence of ice- und auf Blatt 2229 Fulpmes moulded marble can be seen here, some 10 m below the JERZY ZASADNI summit. These pieces of evidence suggest that during the (Auswärtiger Mitarbeiter) maximum ice extent, Mölsjoch pass and ridges adjacent to it were capped with a relatively thin layer of ice that flowed During 2010 Quaternary sediments and landforms were away from the ridge towards the north and the south. No 2 mapped over an area of about 60 km around the Lizum- evidence for ice transfluence can be seen in this area. The er-Reckner peak in the Tux Alps. Investigations were con- Klammjoch (2359 m) and Mölser Scharte (2379 m) passes ducted in the Mölsbach (Mölstal) and Lizumbach (Wattener can, in contrast, be considered to have been transfluence Lizum) valleys (i.e. the upper part of the Wattental val- passes with glacial polishing indicating a relatively high ley), the Klammalm area and the Oberes and Unteres Tarn- level for the ice-surface in relation to these passes. -
Pico North Report, Aug 2012
Report on the Surficial Geology of the Northern Half of the Pico Peak 7.5-Minute Quadrangle, Vermont Stephen F. Wright Department of Geology, University of Vermont August 2012 View looking west, down the Johnson Brook valley with “The Darning Needle” in the background. The mostly mined out gravel pit in the foreground is part of a delta complex deposited where Johnson Brook and a smaller tributary to the left (south) entered a glacial lake that occupied the South Branch of the Tweed River valley and its tributaries as the ice sheet retreated northward. Table of Contents Executive Summary/Significant Findings .................................................................................................3 Introduction................................................................................................................................................ 5 Description of the Mapping Units .............................................................................................................7 Description of the Geologic Cross-section ..............................................................................................15 Interpretation of the Late Pleistocene/Holocene History ........................................................................16 References ...............................................................................................................................................19 UTM coordinates of Photos .....................................................................................................................20 -
Glacial Cirques As Palaeoenvironmental Indicators: Their Potential and Limitations
Glacial cirques as palaeoenvironmental indicators: their potential and limitations Iestyn D. Barr (Corresponding author) School of Geography, Archaeology and Palaeoecology, Queen’s University Belfast, BT7 1NN, Belfast, UK Email: [email protected] Tel: +44 (0)28 9097 5146 Matteo Spagnolo School of Geosciences, University of Aberdeen, Elphinstone Road, AB243UF, Aberdeen, UK Abstract Glacial cirques are armchair-shaped erosional hollows, typified by steep headwalls and, often, overdeepened floors. They reflect former regions of glacier initiation, and their distribution is, therefore, linked to palaeoclimate. Because of this association, cirques can be analysed for the information they provide about past environments, an approach that has a strong heritage, and has seen resurgence over recent years. This paper provides a critical assessment of what cirques can tell us about past environments, and considers their reliability as palaeoenvironmental proxies. Specific focus is placed on information that can be obtained from consideration of cirque distribution, aspect, altitude, and morphometry. The paper highlights the fact that cirques potentially provide information about the style, duration and intensity of former glaciation, as well as information about past temperatures, precipitation gradients, cloud-cover and wind directions. In all, cirques are considered a valuable source of palaeoenvironmental information (if used judiciously), particularly as they are ubiquitous within formerly glaciated mountain ranges globally, thus making regional or even global scale studies possible. Furthermore, cirques often occupy remote and inaccessible regions where other palaeoenvironmental proxies may be limited or lacking. “Custom has not yet made a decision as to the universal name of this feature of mountain sculpture. Many countries furnish their own local names, and the word has been parenthetically translated into three or four languages […]. -
Landscape and Sediment Processes in a Proglacial Valley, the Mittivakkat Glacier Area, Southeast Greenland
Kopi fra DBC Webarkiv Kopi af: Landscape and sediment processes in a proglacial valley, the Mittivakkat Glacier area, Southeast Greenland Dette materiale er lagret i henhold til aftale mellem DBC og udgiveren. www.dbc.dk e-mail: [email protected] Landscape and sediment processes in a proglacial valley, the Mittivakkat Glacier area, Southeast Greenland Bent Hasholt, Johannes Krüger & Lilian Skjernaa Abstract During the Little Ice Age (LIA), the present proglacial Mittivakkat 106 m3 of sediment has been deposited in the valley. The estimated Valley, stretching 1.5 km ENE-WSW from the terminus of the Mitti- volume of glaciofluvial sediments deposited in the valley and delta is vakkat Glacier tongue to a delta terminating in the Sermilik Fjord, 9.9 x 106 m3. Southeast Greenland, was transgressed by the glacier as indicated by Recent sediment transport from the glacier basin of 18.4 km2 a terminal moraine near the valley mouth. The first recordings of the through the Mittivakkat Valley to the Sermilik Fjord at the mouth of glacier terminus in 1933 show a frontal retreat of about 300 m since the valley has been monitored. The annual average is around 7,000 the Little Ice Age (LIA). Since then, the glacier has retreated another m-3. The investigations confirm that a slight net deposition takes 1200 m leaving a valley train characterized by steep slopes flanking place in the upper part of the valley, showing that the proglacial val- a 150-300 m wide flat-bottomed, sediment-floored trough. The larger ley will trap more of the sediment released by glacial erosion if the part of the valley is floored by fluvial sediments and shows a typical Mittivakkat Glacier continues to retreat. -
Flow and Structure in a Dendritic Glacier with Bedrock Steps
Journal of Glaciology (2017), 63(241) 912–928 doi: 10.1017/jog.2017.58 © The Author(s) 2017. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons. org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. Flow and structure in a dendritic glacier with bedrock steps HESTER JISKOOT,1 THOMAS A FOX,1 WESLEY VAN WYCHEN1,2 1Department of Geography, University of Lethbridge, Lethbridge, AB, Canada 2Department of Geography, Environment and Geomatics, University of Ottawa, Ottawa, ON, Canada Correspondence: Hester Jiskoot <[email protected]> ABSTRACT. We analyse ice flow and structural glaciology of Shackleton Glacier, a dendritic glacier with multiple icefalls in the Canadian Rockies. A major tributary-trunk junction allows us to investigate the potential of tributaries to alter trunk flow and structure, and the formation of bedrock steps at con- fluences. Multi-year velocity-stake data and structural glaciology up-glacier from the junction were assimilated with glacier-wide velocity derived from Radarsat-2 speckle tracking. Maximum flow − − speeds are 65 m a 1 in the trunk and 175 m a 1 in icefalls. Field and remote-sensing velocities are in good agreement, except where velocity gradients are high. Although compression occurs in the trunk up-glacier of the tributary entrance, glacier flux is steady state because flow speed increases at the junc- tion due to the funnelling of trunk ice towards an icefall related to a bedrock step. Drawing on a pub- lished erosion model, we relate the heights of the step and the hanging valley to the relative fluxes of the tributary and trunk. -
Subglacial Basins: Their Origin and Importance in Glacial Systems and Landscapes
This is a repository copy of Subglacial basins: Their origin and importance in glacial systems and landscapes. White Rose Research Online URL for this paper: http://eprints.whiterose.ac.uk/100951/ Version: Accepted Version Article: Cook, S.J. and Swift, D.A. orcid.org/0000-0001-5320-5104 (2012) Subglacial basins: Their origin and importance in glacial systems and landscapes. Earth-Science Reviews, 115 (4). pp. 332-372. ISSN 0012-8252 https://doi.org/10.1016/j.earscirev.2012.09.009 Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/) Reuse This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs (CC BY-NC-ND) licence. This licence only allows you to download this work and share it with others as long as you credit the authors, but you can’t change the article in any way or use it commercially. More information and the full terms of the licence here: https://creativecommons.org/licenses/ Takedown If you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing [email protected] including the URL of the record and the reason for the withdrawal request. [email protected] https://eprints.whiterose.ac.uk/ This is an author-formatted version of manuscript http://dx.doi.org/10.1016/j.earscirev.2012.0 .00 . Please cite this work as Cook, S.J. and Swift, D.A. 2012. Subglacial basins: their origin and i portance in glacial syste s and landscapes. -
Analysis of a Paleoglacier Reconstruction Model for Valley Glaciers of the Wind River Range, Wyoming
University of Northern Iowa UNI ScholarWorks Dissertations and Theses @ UNI Student Work 2019 Analysis of a paleoglacier reconstruction model for valley glaciers of the Wind River Range, Wyoming Taylor Rae Garton University of Northern Iowa Let us know how access to this document benefits ouy Copyright ©2019 Taylor Rae Garton Follow this and additional works at: https://scholarworks.uni.edu/etd Part of the Glaciology Commons, and the Physical and Environmental Geography Commons Recommended Citation Garton, Taylor Rae, "Analysis of a paleoglacier reconstruction model for valley glaciers of the Wind River Range, Wyoming" (2019). Dissertations and Theses @ UNI. 963. https://scholarworks.uni.edu/etd/963 This Open Access Thesis is brought to you for free and open access by the Student Work at UNI ScholarWorks. It has been accepted for inclusion in Dissertations and Theses @ UNI by an authorized administrator of UNI ScholarWorks. For more information, please contact [email protected]. Copyright by TAYLOR RAE GARTON 2019 All Rights Reserved ANALYSIS OF A PALEOGLACIER RECONSTRUCTION MODEL FOR VALLEY GLACIERS OF THE WIND RIVER RANGE, WYOMING. An Abstract of a Thesis Submitted in Partial Fulfillment of the Requirements for the Degree Master of Arts Taylor Rae Garton University of Northern Iowa May 2019 ABSTRACT Various approaches, ranging from in-field morphological reconstructions to more technology-based modelling practices allow us to reconstruct and understand the long- term geomorphic evolution of landscapes. The study of paleo-environments by reconstruction can also give us profound insight into paleo-climate. A new model, GlaRe (Glacial Reconstruction), has been introduced into the alpine glacier modeling community to facilitate glacier reconstruction.