Foraminifera from the glacigenic deposits at Broughton Bay, South Wales: evidence for glacimarine or terrestrial ice-sheet deglaciation of the Irish Sea Basin?

2000 ◽  
Vol 111 (2) ◽  
pp. 147-152 ◽  
Author(s):  
Richard A. Shakesby ◽  
William E.N. Austin ◽  
Danny McCarroll
Keyword(s):  
Ice Sheet ◽  
Irish Sea ◽  
South Wales ◽  
The Irish Sea

III.—On Drift

1874 ◽  
Vol 1 (11) ◽  
pp. 496-510 ◽  
Author(s):  
J. G. Goodchild
Keyword(s):  
Ice Sheet ◽  
Irish Sea ◽  
Glacial Deposits ◽  
The North ◽  
The Irish Sea

In a letter to Nature for 14th May, 1874, Mr. Belt has expressed his belief that the presence of shells in glacial deposits, at whatever elevation they may be found, does not necessarily constitute a proof that the land has been depressed to that extent relatively to the level of the sea; but that in such cases as those of the drifts of the basin of the Irish Sea the shells occur in their present positions because they were thrust thither out of the bed of the sea by the ice-sheet which was advancing from the North.

scholarly journals Certain Effects of Glacial Events in the Vale of Glamorgan, South Wales

1966 ◽  
Vol 6 (44) ◽  
pp. 261-266
Author(s):  
C. B. Crampton
Keyword(s):  
Mediterranean Climate ◽  
Irish Sea ◽  
The West ◽  
South Wales ◽  
Melt Water ◽  
The Irish Sea ◽  
Two Phases ◽  
Carboniferous Limestone

AbstractIn South Wales there is evidence for two phases of intense glaciation and an interglacial phase during the Pleistocene. During the closing stages of the earlier glaciation in the west of the Vale of Glamorgan two overflow channels were cut by melt water from an ice lobe off the Glamorgan upland, abutting against ice from the Irish Sea. During retreat, ice from the Irish Sea and local ice deposited material on the Lower Lias outcrop on which two contrasting soils developed. Soils normally associated with a Mediterranean climate developed locally on the outcrop of the Carboniferous Limestone during the interglacial phase.

scholarly journals Late Weichselian Potholes Near Wolverhampton, England

1970 ◽  
Vol 9 (55) ◽  
pp. 125-133 ◽  
Author(s):  
Alan V. Morgan
Keyword(s):  
Sea Ice ◽  
Ice Sheet ◽  
Narrow Channel ◽  
Irish Sea ◽  
Late Weichselian ◽  
The Irish Sea ◽  
Sand And Gravel ◽  
Glacial Streams

Abstract Three potholes and a narrow channel cut into bedrock in a side-hill position were observed beneath an Irish Sea till west of Wolverhampton, England. The potholes and the channel are believed to have been cut by subglacial or latero-glacial streams flowing beneath or immediately beside the Irish Sea ice sheet. They were later choked by sand and gravel from this ice sheet and capped by till which ended the glaciofluvial deposition. Deposits below and above the till have been 14C dated at 30 655 and 13 490 years B.P. at localities between 13 and 27 km north of the trench section described.

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

2013 ◽  
Vol 1 (1) ◽  
pp. 277-309
Author(s):  
H. Patton ◽  
A. Hubbard ◽  
T. Bradwell ◽  
N. F. Glasser ◽  
M. J. Hambrey ◽  
...  
Keyword(s):  
Sea Ice ◽  
Ice Sheets ◽  
Ice Sheet ◽  
Irish Sea ◽  
Swath Bathymetry ◽  
Ice Stream ◽  
Non Linear ◽  
Polar Ice Sheets ◽  
The Irish Sea ◽  
Short Time

Abstract. Understanding the retreat behaviour of past marine-ice sheets provides vital context to accurate assessment 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 British-Celtic Ice Sheet (BCIS) within the Irish Sea Basin. Our reconstruction indicates a non-linear relationship between the rapidly receding Irish Sea Ice Stream, the largest draining the BCIS, and the retreat of outlet glaciers draining the adjacent, terrestrially based ice sheet centred over Wales. Retreat of Welsh ice was episodic; superimposed over low-order oscillations of its margin are asynchronous outlet re-advances 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 dominate the regional bathymetry are attributed to repeated frontal and medial morainic deposition associated with the re-advancing 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-time scales across marine-sectors of the Greenland and Antarctic ice sheets.

An Occurrence of Detrital Diaspore in South Wales

1940 ◽  
Vol 77 (1) ◽  
pp. 74-76 ◽  
Author(s):  
J. C. Griffiths ◽  
Alan Stuart
Keyword(s):  
Specific Gravity ◽  
Irish Sea ◽  
Iron Ores ◽  
Glacial Deposits ◽  
Double Refraction ◽  
South West ◽  
South Wales ◽  
Boulder Clay ◽  
The Irish Sea

During the course of a petrological investigation by one of us (J. C. G.) of the glacial deposits in South-West Wales, samples from a sandy boulder clay at Ludchurch in South-East Pembrokeshire were found to contain abundant grains of a platy colourless mineral with a specific gravity greater than 2·9, a perfect pinacoidal cleavage and high double refraction. This was ultimately diagnosed as diaspore, with which were associated various iron ores, zircon, rutile, chlorite, various tourmalines (brown, green, and pink being the commonest), pyroxenes, amphiboles, staurolite, kyanite, brookite, anatase, topaz, garnet, apatite, muscovite, and andalusite, an assemblage typical of the Irish Sea Drift of this district. A search through the literature for a description of detrital diaspore showed that there did not appear to have been published any detailed description with figures of the detrital forms.

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

2013 ◽  
Vol 1 (1) ◽  
pp. 53-65 ◽  
Author(s):  
H. Patton ◽  
A. Hubbard ◽  
T. Bradwell ◽  
N. F. Glasser ◽  
M. J. Hambrey ◽  
...  
Keyword(s):  
Sea Ice ◽  
Ice Sheets ◽  
Ice Sheet ◽  
Irish Sea ◽  
Swath Bathymetry ◽  
Ice Cap ◽  
Ice Stream ◽  
Non Linear ◽  
Polar Ice Sheets ◽  
The Irish Sea

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 non-linear 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.

scholarly journals Certain Effects of Glacial Events in the Vale of Glamorgan, South Wales

1966 ◽  
Vol 6 (44) ◽  
pp. 261-266 ◽  
Author(s):  
C. B. Crampton
Keyword(s):  
Mediterranean Climate ◽  
Irish Sea ◽  
The West ◽  
South Wales ◽  
Melt Water ◽  
The Irish Sea ◽  
Two Phases ◽  
Carboniferous Limestone

Abstract In South Wales there is evidence for two phases of intense glaciation and an interglacial phase during the Pleistocene. During the closing stages of the earlier glaciation in the west of the Vale of Glamorgan two overflow channels were cut by melt water from an ice lobe off the Glamorgan upland, abutting against ice from the Irish Sea. During retreat, ice from the Irish Sea and local ice deposited material on the Lower Lias outcrop on which two contrasting soils developed. Soils normally associated with a Mediterranean climate developed locally on the outcrop of the Carboniferous Limestone during the interglacial phase.

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