The nature and maximum extent of glacial sediments off the west coast of Wales

Garrard, R. A.; Dobson, M. R.

doi:10.1016/0025-3227(74)90024-3

Cited by 25 publications

(34 citation statements)

References 7 publications

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“…Based on Sarn Badrig's relatively large volume (∼ 1 km 3 ) and proximity to the main accumulation centres of the Welsh Ice Cap, it is speculated that the three sarns in Cardigan Bay are enduring features that have been reworked and added to over the course of numerous glaciations during the Pleistocene. This is supported by boreholes indicating "Welsh drift" over 100 m deep in the centre of Tremadog Bay (Garrard and Dobson, 1974), attesting to long-lived and/or rapid rates of glacigenic sediment deposition in this area.…”

Section: Sarn Badrigmentioning

confidence: 65%

“…Ottesen and Dowdeswell, 2006;Ottesen et al, 2007;Nygård et al, 2008). The fact that these ridges are found well within the Welsh drift limit identified by Garrard and Dobson (1974) and east of exposures of Welsh till on the Llŷn Peninsula at Porth Ceiriad (Whittow and Ball, 1970) indicates that these ridges do not mark the maximum extent of Welsh glaciation, and must have been deposited following separation from Irish Sea ice during overall ice-sheet retreat.…”

Section: Moraines: (A)mentioning

confidence: 80%

“…Garrard and Dobson (1974). Contains Maritime and Coastguard Agency bathymetry data © Crown Copyright.…”

Section: Geomorphological Mapping Resultsmentioning

confidence: 99%

“…Offshore in Cardigan Bay, numerous boreholes and geophysical surveys have identified a limit of Welshsourced till broadly perpendicular to the western end of the three sarns (Garrard and Dobson, 1974; Fig. 1).…”

Section: Geological Contextmentioning

confidence: 99%

“…5b), Sarn Badrig is interpreted as a large "ice-stream" interaction medial moraine -the merging of two lateral moraines (Eyles and Rogerson, 1978a). This type of moraine forms at the intersection of confluent valley glaciers below or close to the equilibrium line, and their morphological expression Garrard and Dobson (1974).…”

Section: Sarn Badrigmentioning

confidence: 99%

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Rapid marine deglaciation: asynchronous retreat dynamics between the Irish Sea Ice Stream and terrestrial outlet glaciers

et al. 2013

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Abstract. Understanding the retreat behaviour of past marine-based ice sheets provides vital context for accurate assessments of the present stability and long-term response of contemporary polar ice sheets to climate and oceanic warming. Here new multibeam swath bathymetry data and sedimentological analysis are combined with high resolution ice-sheet modelling to reveal complex landform assemblages and process dynamics associated with deglaciation of the Celtic ice sheet within the Irish Sea Basin. Our reconstruction indicates a nonlinear relationship between the rapidly receding Irish Sea Ice Stream and the retreat of outlet glaciers draining the adjacent, terrestrially based ice cap centred over Wales. Retreat of Welsh ice was episodic; superimposed over low-order oscillations of its margin are asynchronous outlet readvances driven by catchment-wide mass balance variations that are amplified through migration of the ice cap's main ice divide. Formation of large, linear ridges which extend at least 12.5 km offshore (locally known as sarns) and which dominate the regional bathymetry are attributed to repeated frontal and medial morainic deposition associated with the readvancing phases of these outlet glaciers. Our study provides new insight into ice-sheet extent, dynamics and non-linear retreat across a major palaeo-ice stream confluence zone, and has ramifications for the interpretation of recent fluctuations observed by satellites over short timescales across marine sectors of the Greenland and Antarctic ice sheets.

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Section: Sarn Badrigmentioning

confidence: 65%

Section: Moraines: (A)mentioning

confidence: 80%

“…Garrard and Dobson (1974). Contains Maritime and Coastguard Agency bathymetry data © Crown Copyright.…”

Section: Geomorphological Mapping Resultsmentioning

confidence: 99%

Section: Geological Contextmentioning

confidence: 99%

Section: Sarn Badrigmentioning

confidence: 99%

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Rapid marine deglaciation: asynchronous retreat dynamics between the Irish Sea Ice Stream and terrestrial outlet glaciers

et al. 2013

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Holocene sea-level changes and crustal movements in Morecambe Bay, northwest England

Zong

Tooley

1996

J. Quaternary Sci.

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Microfaunas, microfloras and the environmental stratigraphy of the Late Glacial and Holocene in Cardigan Bay

1977

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The distribution of foraminifers, ostracods, diatoms and pollen is studied in cores from submarine boreholes. This reveals that the history of the Flandrian transgression is largely the record of the infilling of meltwater channels cut during the early Late Glacial with transgressive estuarine and finally marine deposits. It also supports the idea of the 'climatic earliness' of the Welsh seaboard at all stages. Estuarine deposits in excess of -51 m O.D. suggest that Late Glacial sea levels were initially as low as -60 m O.D. and support the idea that the Welsh ice withdrew before 14,000 years B.P. The sea-level rise plots as a smooth curve but was probably episodic in its early phases.

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The nature and maximum extent of glacial sediments off the west coast of Wales

Cited by 25 publications

References 7 publications

Rapid marine deglaciation: asynchronous retreat dynamics between the Irish Sea Ice Stream and terrestrial outlet glaciers

Rapid marine deglaciation: asynchronous retreat dynamics between the Irish Sea Ice Stream and terrestrial outlet glaciers

Holocene sea-level changes and crustal movements in Morecambe Bay, northwest England

Microfaunas, microfloras and the environmental stratigraphy of the Late Glacial and Holocene in Cardigan Bay

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