‘A test of the englacial thrusting hypothesis of “hummocky” moraine formation: case studies from the northwest Highlands, Scotland’: Comments

Graham, David J.; Bennett, Matthew R.; Glasser, Neil F.; Hambrey, Michael J.; Huddart, David; Midgley, Nicholas G.

doi:10.1111/j.1502-3885.2007.tb01184.x

Cited by 14 publications

(40 citation statements)

References 39 publications

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“…Furthermore, complex reworking of glaciogenic sediments is likely to affect the morphology and distribution of sedimentary facies (Bennett et al, 2000;Sletten et al, 2001;Lønne and Lyså, 2005;Lukas et al, 2005). These adjustments to the sedimentary record have, therefore, generated much debate regarding palaeoglacial sedimentary units and their use in environmental reconstruction (e.g., Dyke and Savelle, 2000;Woodward et al, 2002;Lukas, 2005Lukas, , 2007Graham et al, 2007).…”

Section: Introductionmentioning

confidence: 97%

Recent High-Arctic glacial sediment redistribution: A process perspective using airborne lidar

et al. 2011

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Section: Introductionmentioning

confidence: 97%

Recent High-Arctic glacial sediment redistribution: A process perspective using airborne lidar

et al. 2011

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“…The long-term preservation potential of such landforms has been debated owing to the potential ice component within the landforms (Lukas, 2005;Graham et al, 2007;Lukas, 2007;Evans, 2009) ( Table 1). Lowering is, however, limited on areas of topographic prominence (e.g., the hummocks; Fig.…”

Section: Implications Of Subsurface Observations On Long-term Landscamentioning

confidence: 99%

“…The validity of such analogues relies upon a lack of buried ice in the proglacial area in order for the landforms to be preserved through a period of complete deglaciation. Consequently, the extent to which Neoglacial moraines in Svalbard serve as Pleistocene analogues has been subject to debate (e.g., Lukas, 2005Lukas, , 2007Graham et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Evolution of high-Arctic glacial landforms during deglaciation

et al. 2018

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Glacial landsystems in the high-Arctic have been reported to undergo geomorphological transformation during deglaciation. This research evaluates moraine evolution over a decadal timescale at Midtre Lovénbreen, Svalbard. This work is of interest because glacial landforms developed in Svalbard have been used as an analogue for landforms developed during Pleistocene mid-latitude glaciation. Ground penetrating radar was used to investigate the subsurface characteristics of moraines. To determine surface change, a LiDAR topographic data set (obtained 2003) and a UAV-derived (obtained 2014) digital surface model processed using structure-from-motion (SfM) are also compared. Evaluation of these data sets together enables subsurface character and landform response to climatic amelioration to be linked. Ground penetrating radar evidence shows that the moraine substrate at Midtre Lovénbreen includes ice-rich (radar velocities of 0.17 m ns (mean thresholded rate of −4.39 m over the 11-year observation period). However, the debris-rich zones show a relatively low rate of surface change (mean thresholded rate of −0.98 m over the 11-year observation period), and the morphology of the debris-rich landforms appear stable over the observation period. A complex response of proglacial landforms to climatic warming is shown to occur within and between glacier forelands as indicated by spatially variable surface lowering rates. Landform response is controlled by the ice-debris balance of the moraine substrate, along with the topographic context (such as the influence of meltwater). Site-specific characteristics such as surface debris thickness and glaciofluvial drainage are, therefore, argued to be a highly important control on surface evolution in ice-cored terrain, resulting in a diverse response of high-Arctic glacial landsystems to climatic amelioration. These results highlight that care is needed when assessing the long-term preservation potential of contemporary landforms at high-Arctic glaciers. A better understanding of ice-cored terrain facilitates the development of appropriate age and climatic interpretations that can be obtained from palaeo ice-marginal landsystems.

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“…We present two forms of hummocky terrain in the study area (irregular and regular), and opt for this nomenclature rather than hummocky moraine (Graham et al, 2007;Lukas, 2005Lukas, , 2007 or controlled moraine (Evans, 2009) to avoid genetic inference. In the field, the hummocky terrain appears as patches of small, semi-rounded hills, rarely more than five metres high (and often less) and 10 metres across.…”

Section: Irregular Hummocky Terrainmentioning

confidence: 99%

A glacial geomorphological map of the southernmost ice lobes of Patagonia: the Bahía Inútil – San Sebastián, Magellan, Otway, Skyring and Río Gallegos lobes

et al. 2014

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This paper presents a glacial geomorphological map of the landforms created by five large ice lobes that extended eastwards from the southernmost reaches of the Patagonian Ice Sheet during the Quaternary period. The study is focussed on Tierra del Fuego, but also updates previous mapping of the Skyring and Otway lobes, and the resulting level of detail and extent is a significant advance on previous work in the region. The map has been created as the necessary precursor for an improved understanding of the glacial history of the region, and to underpin a programme of dating glacial limits in the region. It was produced using Landsat ETM+ and ASTER satellite imagery and vertical aerial photography, supplemented by Google Earth TM imagery and field-checking. Eleven landform types were mapped: moraine ridges, subdued moraine topography, kettle-kame topography, glacial lineations, irregular and regular hummocky terrain, irregular dissected ridges, eskers, meltwater channels, former shorelines and outwash plains. The map reveals three important characteristics of the glacial geomorphology. First, the geomorphic systems are largely dominated by landforms associated with meltwater (channels, outwash plains and kettle-kame topography). Second, there is a difference in the nature of landforms associated with the northern three ice lobes, where limits are generally marked by numerous clear moraine ridges, compared to those to the south, where hummocky terrain and drift limits prevail. Finally, cross-cutting landforms offer evidence of multiple advances, in places, which has implications for the timing of limit deposition, and thus for the design and interpretation of a dating programme.

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‘A test of the englacial thrusting hypothesis of “hummocky” moraine formation: case studies from the northwest Highlands, Scotland’: Comments

Cited by 14 publications

References 39 publications

Recent High-Arctic glacial sediment redistribution: A process perspective using airborne lidar

Recent High-Arctic glacial sediment redistribution: A process perspective using airborne lidar

Evolution of high-Arctic glacial landforms during deglaciation

A glacial geomorphological map of the southernmost ice lobes of Patagonia: the Bahía Inútil – San Sebastián, Magellan, Otway, Skyring and Río Gallegos lobes

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