Glacial map of Canada

Prest, V K; Grant, Douglas; Rampton, V N

doi:10.4095/108979

Cited by 239 publications

(99 citation statements)

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“…Ridge lengths range from 100 m to 3873 m, with 63% of landforms having a typical length range of 300-1200 m (mean 447 m), which is consistent with typical lengths reported in a large representative database by Dunlop and Clark (2006). The distribution of mapped ribbed moraines extends the previously documented population of ribbed moraine in the Glacial Map of Canada (Prest et al, 1968) with 28% of mapped ridges recorded in areas not previously categorised as ribbed terrain. The mapped ribbed moraines commonly display similar morphological characteristics to those reported in the Dunlop and Clark (2006) classification and include, for example, classic downstream curving, broad arcuate, jagged and hummocky ridges ( Figure 5).…”

Section: Ribbed Morainessupporting

confidence: 84%

“…Prest et al, 1968) by being the first map that documents the spatial distribution of individually mapped subglacial bedforms across the entire island of Newfoundland (Figure 8). It offers a new record of almost 127,000 individual subglacial bedforms and is a comprehensive new landform database that builds upon previous landform research in the region.…”

Section: Discussionmentioning

confidence: 99%

“…These regularly spaced ridges, aligned transverse to ice flow, are widely accepted to have formed subglacially and are located across considerable areas of the former Laurentide, Fennoscandian, British-Irish and Newfoundland ice sheets (NISs) (Aylsworth & Shilts, 1989;Bouchard, 1989;Clark, 1999;Clark & Meehan, 2001;Dunlop & Clark, 2006;Knight & McCabe, 1997;Lundqvist, 1969Lundqvist, , 1989Marich et al, 2005;Prest et al, 1968;Stokes, Lian, Tulaczyk, & Clark, 2008). Ridge lengths range from 100 m to 3873 m, with 63% of landforms having a typical length range of 300-1200 m (mean 447 m), which is consistent with typical lengths reported in a large representative database by Dunlop and Clark (2006).…”

Section: Ribbed Morainesmentioning

confidence: 99%

“…Clark et al, 2000;Greenwood & Clark, 2009a;Jansson, Kleman, & Marchant, 2002;Kleman, 1992;Trommelen, Ross, & Ismail, 2014). Currently, the only published glacial map that covers the entire island of Newfoundland is the 1:5,000,000 scale Glacial Map of Canada (Prest, Grant, & Rampton, 1968) which is available to download from the Geological Survey of Canada. Although this map provides a good overview of landform distribution, its scale restricts its use for identifying the complex ice flow patterns and regional scale variability which is fundamental for accurate palaeo-glaciological reconstructions (Kleman & Borgström, 1996).…”

Section: Introductionmentioning

confidence: 99%

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The subglacial imprint of the last Newfoundland Ice Sheet, Canada.

McHenry

Dunlop

2015

Journal of Maps

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The former Newfoundland Ice Sheet was situated on the fringes of the northeast Atlantic Ocean during the Wisconsinan glaciation ( 80-10 ka BP). Its geographic position indicates that it was likely to have been influenced by a number of external and internal forcing mechanisms including configuration changes in the Laurentide Ice Sheet with which it converged during the last glacial maximum, ice streams, changes in oceanic circulation and fluctuating sea levels. This makes Newfoundland a key location for investigating the dynamic response of ice sheets to these types of internal and external drivers. An established methodology for investigating ice sheet dynamics is to use the landform record to reconstruct the dynamic behaviour and configuration of the ice sheet. This provides a relative chronology of former ice sheet events during glacial cycles. A fundamental requirement of this approach is a detailed glacial geomorphology map that records the spatial distribution of individual subglacial bedforms across the former ice sheet bed. This paper presents a new subglacial bedform map of the Island of Newfoundland. It was produced as part of a mapping programme which used 10 m resolution Satellite Pour l'Observation de la Terre satellite imagery, Shuttle Radar Topography Mission and Canadian Digital Elevation Data. The map records the spatial distribution of 126,000 individually mapped glacial lineations and ribbed moraines and extends the number and spatial extent of each landform across the island. It is a new data set which has the potential to provide important insights into former ice sheet behaviour in this region.

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Section: Ribbed Morainessupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Ribbed Morainesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The subglacial imprint of the last Newfoundland Ice Sheet, Canada.

McHenry

Dunlop

2015

Journal of Maps

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“…Streaming has also been depicted in the north-west LIS by Kleman and Glasser (2007) and Winsborrow et al (2004), although little detailed analysis is presented. Prest et al (1968) provide a continental map at a scale of 1:5,000,000 that indicates a complex bedform arrangement in the north-west sector. However, the map does not identify areas of cross-cutting bedforms which are vital for the development of accurate palaeo-ice sheet reconstructions (cf.…”

Section: Introductionmentioning

confidence: 99%

The Glacial Geomorphology of the North-West sector of the Laurentide Ice Sheet

Brown¹,

Stokes²,

Ó'Cofaigh³

2011

Journal of Maps

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This paper presents a new map of the glacial geomorphology of ∼ 800,000 km 2 of north-west Canada. The mapped area includes parts of Northwest Territories and Nunavut which were covered by the Laurentide Ice Sheet during the Late Wisconsinan glaciation. It has been hypothesized that ice streaming occurred here during this time and the area has also been identified as a potential drainage pathway of glacial Lake Agassiz. Mapping was carried out remotely using a range of spaceborne imagery with varying spatial resolutions, including Landsat ETM+, ASTER and SRTM. Aerial photography was also used in areas where cloud obscured the Landsat imagery. The map records 94,780 individual landforms including moraines, eskers, large meltwater channels and lineations. Highly elongate bedforms with convergent flow traces and abrupt lateral margins are abundant throughout the mapped area and most likely represent former zones of streaming flow. Numerous eskers can be traced for tens of kilometres and are found both parallel and sub-parallel to abundant lineations. Moraine ridges are also identified which mark Late Wisconsinan ice margin positions and a series of smaller ridges are also identified within areas of hummocky topography. The map is intended to form the basis of a regional ice sheet reconstruction from the Last Glacial Maximum through to deglaciation, which we suggest is likely to involve marked changes in the spatial and temporal activity of ice streams.

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Reconstruction of Palaeo-Ice Sheets: The Use of Geomorphological Data

Klemån

Borgström

1996

Earth Surf. Process. Landforms

170

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The article discusses the nature of the glacial inversion problem, which is defined as the extraction of time-slice ice-sheet flow patterns from the patchy and partly overprinted landform record present in former ice-sheet areas. A coherent inversion model for derivation of flow patterns and interior ice-sheet configuration from geomorphological data is presented. Glacial landscapes are classified according to the three criteria of internal age gradients, presence or absence of meltwater traces aligned to flow traces, and basal condition (frozen bed/thawed bed) inferred from morphology. The inversion model uses landscapes classified accordingly, spatially delineated into fans, as input data. Relative chronologies at fan intersections are used to sort fans in a relative-age stack that can be linked to stratigraphic (dating) information.

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Glacial map of Canada

Cited by 239 publications

References 0 publications

The subglacial imprint of the last Newfoundland Ice Sheet, Canada.

The subglacial imprint of the last Newfoundland Ice Sheet, Canada.

The Glacial Geomorphology of the North-West sector of the Laurentide Ice Sheet

Reconstruction of Palaeo-Ice Sheets: The Use of Geomorphological Data

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