A fabric analysis of the ground moraine deposits of the lleyn Peninsula of Southwest Caernarvonshire

Saunders, Gerald

doi:10.1002/gj.3350060110

Cited by 22 publications

(1 citation statement)

References 16 publications

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“…It is more challenging to determine the northwestern extent of the Welsh Ice Cap during this ice-flow event. 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.…”

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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The Late Devensian glaciation of the eastern Lleyn Peninsula, North Wales: evidence for terrestrial depositional environments

1998

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Ice directions in western lleyn and the status of the gwynedd readvance of the last irish sea glacier

McCarroll

1991

Geological Journal

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A ‘Gwynedd readvance’ of the last Irish Sea glacier, terminating on the north coast of the Lleyn peninsula in northwest Wales, has been proposed on the basis of differences in ice flow direction and in drift landforms on either side of the proposed limit. However, detailed drift mapping of western Lleyn reveals erosional and depositional evidence of ice flow direction which are consistent with a single advance and retreat. Differences in drift landforms are explained by the influence of topography on glacier dynamics and sedimentation. There is, therefore, no reason to invoke a ‘Gwynedd readvance’ of the last Irish Sea glacier and the marked climatic deterioration which a substantial readvance of such a large glacier would imply.

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A fabric analysis of the ground moraine deposits of the lleyn Peninsula of Southwest Caernarvonshire

Cited by 22 publications

References 16 publications

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

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

The Late Devensian glaciation of the eastern Lleyn Peninsula, North Wales: evidence for terrestrial depositional environments

Ice directions in western lleyn and the status of the gwynedd readvance of the last irish sea glacier

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