Phased occupation and retreat of the last British–Irish Ice Sheet in the southern North Sea; geomorphic and seismostratigraphic evidence of a dynamic ice lobe

Dove, Dayton; Evans, David J. A.; Lee, Jonathan R.; Roberts, David H.; Tappin, David R.; Mellett, Claire L.; Long, David A.; Callard, S. Louise

doi:10.1016/j.quascirev.2017.03.006

Cited by 28 publications

(61 citation statements)

References 82 publications

(1 reference statement)

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“…AF1 can be clearly identified as bedrock but AF2 and AF3 have characteristics similar to subglacial diamicts. Such acoustic properties have previously been interpreted as subglacial tills (Cameron et al, 1992;Gatliff et al, 1994;Huuse and Lykke-Anderson, 2000;Dove et al, 2017), with the heterogeneous nature of diamictic sediments resulting in acoustic homogeneity when observed in seismic profile (Hogan et al, 2016). In contrast, AF3 forms distinctive, discontinuous sheets across the study area and has an average thickness of~4-10 m. It can thicken to 15-20 m where it forms the wedges.…”

Section: Subglacial Sediment and Landform Genesismentioning

confidence: 80%

“…As such it was an area characterised by complex ice sheet dynamics resulting from ice sheet coalescence, decoupling, ice divide migration, marine inundation and the switching on and off of ice streams (Graham et al, 2007(Graham et al, , 2011Sejrup et al, 2016;Patton et al, 2017). The vast majority of the evidence for the NSL has been derived from onshore glaciogenic sediment exposures, ice marginal geomorphology and palaeoice dammed lakes (Wood and Rome, 1868;Lamplugh, 1879, Bisat, 1932Eyles et al, 1982;Evans et al, 1995;Catt, 2007;Bateman et al, 2008Bateman et al, , 2011Bateman et al, , 2015Bateman et al, , 2017Evans and Thomson, 2010;Davies et al, 2009Davies et al, , 2012aRoberts et al, 2013), however, few studies (with the exception of Davies et al, 2011;Dove et al, 2017) have focused on the offshore imprint of the NSL. The vast majority of the evidence for the NSL has been derived from onshore glaciogenic sediment exposures, ice marginal geomorphology and palaeoice dammed lakes (Wood and Rome, 1868;Lamplugh, 1879, Bisat, 1932Eyles et al, 1982;Evans et al, 1995;Catt, 2007;Bateman et al, 2008Bateman et al, , 2011Bateman et al, , 2015Bateman et al, , 2017Evans and Thomson, 2010;Davies et al, 2009Davies et al, , 2012aRoberts et al, 2013), however, few studies (with the exception of Davies et al, 2011;…”

Section: Introductionmentioning

confidence: 99%

“…Major drainage basins feeding the NSL include the Firth of Forth, Tweed (Tw), Tyne Gap (Ty) and the Eden-Stainmore (Ed-St) gap (image based on reconstruction of Dove et al, 2017 andRoberts et al, 2018). Recently, Dove et al (2017) have demonstrated that multiple tills associated with the Bolders Bank Formation form distinctive off-lapping sheets or arcuate moraines across the seafloor. Recently, Dove et al (2017) have demonstrated that multiple tills associated with the Bolders Bank Formation form distinctive off-lapping sheets or arcuate moraines across the seafloor.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Dove et al (2017) have demonstrated that multiple tills associated with the Bolders Bank Formation form distinctive off-lapping sheets or arcuate moraines across the seafloor. The stratigraphic architecture of the till sheets and moraines suggest a dynamic, oscillating margin operating over a deforming bed, with tunnel valleys indicating a surplus of meltwater during deglaciation (Dove et al, 2017). The stratigraphic architecture of the till sheets and moraines suggest a dynamic, oscillating margin operating over a deforming bed, with tunnel valleys indicating a surplus of meltwater during deglaciation (Dove et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Further north, however, in the area offshore from Durham and Northumberland, very little is known of the glaciogenic imprint of the NSL across the seafloor. Yet it remains unclear as to whether the NSL behaved as an ice stream, a terrestrial piedmont lobe or a tidewater terminating glacier (Golledge and Stoker, 2006;Boston et al, 2010;Dove et al, 2017). Given the NSL was sourced from central Scotland via the Firth of Forth, the influence of the NSL on the BIIS in terms of ice divide migration, ice drawdown and flow trajectory would have been significant (particularly during deglaciation; Roberts et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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The mixed‐bed glacial landform imprint of the North Sea Lobe in the western North Sea

Roberts

Grimoldi

Callard

et al. 2019

Earth Surf Processes Landf

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During the last glacial cycle an intriguing feature of the British‐Irish Ice Sheet was the North Sea Lobe (NSL); fed from the Firth of Forth and which flowed south and parallel to the English east coast. The controls on the formation and behaviour of the NSL have long been debated, but in the southern North Sea recent work suggests the NSL formed a dynamic, oscillating terrestrial margin operating over a deforming bed. Further north, however, little is known of the behaviour of the NSL or under what conditions it operated. This paper analyses new acoustic, sedimentary and geomorphic data in order to evaluate the glacial landsystem imprint and deglacial history of the NSL offshore from NE England. Subglacial tills (AF2/3) form a discontinuous mosaic interspersed with bedrock outcrops across the seafloor, with the partial excavation and advection of subglacial sediment during both advance and retreat producing mega‐scale glacial lineations and grounding zone wedges. The resultant ‘mixed‐bed’ glacial landsystem is the product of a dynamic switch from a terrestrial piedmont‐lobe margin with a net surplus of sediment to a partially erosive, quasi‐stable, marine‐terminating, ice stream lobe as the NSL withdrew northwards. Glaciomarine sediments (AF4) drape the underlying subglacial mixed‐bed imprint and point to a switch to tidewater conditions between 19.9 and 16.5 ka cal BP as the North Sea became inundated. The dominant controls on NSL recession during this period were changing ice flux through the Firth of Forth ice stream onset zone and water depths at the grounding line; the development of the mixed‐bed landsystem being a response to grounding line instability. © 2018 John Wiley & Sons, Ltd.

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Section: Subglacial Sediment and Landform Genesismentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The mixed‐bed glacial landform imprint of the North Sea Lobe in the western North Sea

Roberts

Grimoldi

Callard

et al. 2019

Earth Surf Processes Landf

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Landscape evolution during Holocene transgression of a mid‐latitude low‐relief coastal plain: The southern North Sea

Eaton,

Barlow,

Hodgson

et al. 2024

Earth Surf Processes Landf

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Low‐relief coastal landscapes are at major risk of rising sea levels, as vertical changes in relative sea level have far‐reaching lateral effects. Integration of a dense 2D grid of seismic reflection data with sedimentological and geotechnical data obtained in two offshore wind farm zones allows detailed documentation of postglacial landforms and environmental change over a 1,021 km2 area in the western sector of the southern North Sea. Following the retreat of Last Glacial Maximum ice sheets from the southern North Sea, the resulting postglacial terrestrial landscape provided a surface for peatland formation as climate started to warm and the water table rose in response to relative sea‐level rise. Southward‐draining fluvial networks formed contemporaneously with the peatlands, and remnants of this terrestrial wetland landscape are buried beneath Holocene marine sediments. Distinctive isolated incisional features and discrete widening of fluvial channels that cut through the peats are interpreted as either tidal ponds or relict tidal channels. These features record the evolution of this landscape through the Early Holocene as marine transgression inundated a low‐relief coastal plain. The erosion of the peatlands observed in the cores, the patchy preservation of the organic wetland landscape, and the lack of preserved barrier systems recorded by the seismic reflection data suggest that the rate of relative sea‐level rise outpaced sediment supply during the Late Postglacial and Early Holocene in this area of the southern North Sea. In a regional context, the southward draining river channels contrast to northward fluvial drainage to the North Sea, pointing to a subtle drainage divide in the palaeolandscape and the presence of a low‐relief land bridge separating the North Sea and the English‐Channel/La Manche during the Early Holocene. The documented scenario of rising sea levels combined with decreasing sediment supply in a low‐relief setting is a situation faced by many global deltas and coastlines, which makes the southern North Sea a crucial archive of coastal landscape change.

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Lateglacial/early Holocene palaeoenvironments in the southern North Sea Basin: new data from the Dudgeon offshore wind farm

Brown

Russell²,

Scaife

et al. 2018

J Quaternary Science

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It is well known that the North Sea conceals an extensive former landscape of Late Pleistocene and Holocene date that was progressively submerged as result of rising post-glacial sea levels. Although an increasingly detailed picture is emerging of these submerged palaeolandscapes, well-dated palaeoenvironmental reconstructions from the North Sea Basin remain few and far between. Pollen, foraminifera, ostracod, plant macrofossil and molluscan data are presented from a radiocarbon-dated core retrieved from the site of the Dudgeon offshore wind farm, located in the southern North Sea Basin. The palaeoenvironmental analysis provides new data on changing local physical and vegetation environments in the southern North Sea Basin, occurring against a background of global climate change and rising sea levels. Subalpine plant communities gradually gave way to hazel-dominated woodland during the early Holocene, with freshwater environments replaced by increasing signs of estuarine influence from ca. 9500 to 9000 cal a BP. The thin upper peat (8411-8331 cal a BP) raises the possibility that the final inundation of the Dudgeon site may be linked to meltwater pulses following the collapse of the Laurentide Ice Sheet and the draining of the proglacial Lakes Agassiz and Ojibway.

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Phased occupation and retreat of the last British–Irish Ice Sheet in the southern North Sea; geomorphic and seismostratigraphic evidence of a dynamic ice lobe

Cited by 28 publications

References 82 publications

The mixed‐bed glacial landform imprint of the North Sea Lobe in the western North Sea

The mixed‐bed glacial landform imprint of the North Sea Lobe in the western North Sea

Landscape evolution during Holocene transgression of a mid‐latitude low‐relief coastal plain: The southern North Sea

Lateglacial/early Holocene palaeoenvironments in the southern North Sea Basin: new data from the Dudgeon offshore wind farm

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