Exploration of sand and gravel resources by geomorphological analysis in the glacial sediments of the Eastern Lleyn Peninsula, Gwynedd, North Wales

Crimes, T. P.; Chester, David K.; Thomas, G. S. P.

doi:10.1016/0013-7952(92)90042-w

Cited by 10 publications

(3 citation statements)

References 11 publications

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“…The Lleyn Peninsula has been affected by westward-flowing Welsh ice from the higher massifs to the east (Saunders 1968;Whittow & Ball 1970;Thomas et al 1998), and the summits of the Rhinog Mountains were abraded by westward-flowing ice (Greenly 1919). It is also possible that westward-flowing ice from the western side of Snowdonia (Crimes et al 1992) occurred during this ice-flow event. The major influence on Anglesey and the Lleyn Peninsula is, however, from approximately southwardflowing ice of the British-Irish Ice Sheet (e.g.…”

Section: Event I (Oldest Phase)mentioning

confidence: 99%

Palaeoglaciology of the Welsh sector of the British–Irish Ice Sheet

Jansson

Glasser²

2005

JGS

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This palaeoglaciological reconstruction, based on the distribution of glacial lineations interpreted from satellite imagery, considers the extent, thickness and dynamics of the Welsh Ice Cap and its interaction with the British-Irish Ice Sheet. Two major ice-flow events were identified. The oldest phase of ice flow (Event I) is characterized by ice flowing from an ice dispersal centre situated over the higher terrain in northcentral Wales and by ice thick enough to cover the mountain summits. At this time the interior of the ice cap is inferred to have been dominated by cold-based ice. During the growth of the Welsh Ice Cap it became confluent with the British-Irish Ice Sheet. The Welsh Ice Cap at this time was again sufficiently thick to submerge the highest mountain summits. The youngest detected phase of ice flow (Event II) was marked by an abrupt change in the dynamics of the Welsh Ice Cap. During Event II the Welsh Ice Cap was drained by at least four ice streams, which followed major troughs in northern and eastern Wales.

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Section: Event I (Oldest Phase)mentioning

confidence: 99%

Palaeoglaciology of the Welsh sector of the British–Irish Ice Sheet

Jansson

Glasser²

2005

JGS

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“…At the regional scale there is some independent evidence that glaciation has been responsible for the formation of over-deepened rock basins, for example in the middle Usk valley (Crimes et al, 1992) and in the Black Mountains (Lewis and Thomas, 2005). However, the majority of valleys leading out from the Brecon Beacons do not show evidence of over-deepening, for example in the form of rock basins or lake basins.…”

Section: Cirques or Fluvial Valley Heads?mentioning

confidence: 97%

Modification of peripheral mountain ranges by former ice sheets: The Brecon Beacons, Southern UK

Jansson¹,

Glasser²

2008

Geomorphology

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“…Sand and gravel deposits are vital aggregate resources that contribute significantly to the economy as essential components of the construction industry (Masters, 1978;Langer, 1988;Crimes et al, 1992;Merritt, 1992;Poulin et al, 1994;Sutphin et al, 2006;Bayer et al, 2011;Comunian et al, 2011). Demand of surface and near-source supplies of aggregate resources upsurges due to the rapid expansion of some urban and metropolitan areas.…”

Section: Introductionmentioning

confidence: 99%