Ice-marginal sedimentation associated with the Late Devensian Welsh Ice Cap and the Irish Sea Ice Stream: Tonfanau, West Wales

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dc.contributor.author Patton, Henry
dc.contributor.author Hambrey, Michael J.
dc.date.accessioned 2010-12-20T11:51:03Z
dc.date.available 2010-12-20T11:51:03Z
dc.date.issued 2009-11-05
dc.identifier.citation Patton , H & Hambrey , M J 2009 , ' Ice-marginal sedimentation associated with the Late Devensian Welsh Ice Cap and the Irish Sea Ice Stream: Tonfanau, West Wales ' Proceedings of the Geologists' Association , vol 120 , no. 4 , pp. 256-274 . en
dc.identifier.other PURE: 155163
dc.identifier.other dspace: 2160/6027
dc.identifier.uri http://hdl.handle.net/2160/6027
dc.description Issue title: Quaternary Geology of the British Isles: Part 1 (David Bridgland and Nick Golledge (Eds) Sponsorship: BGS-University Funding Initiative en
dc.description.abstract This paper provides the first comprehensive description and interpretation of Late Devensian glacigenic deposits exposed in a 2 km-long cliff section at Tonfanau, Mid-West Wales. The section offers crucial insight concerning glacier dynamics and sedimentation on the eastern margin of the Irish Sea Basin. Six lithofacies are identified: diamicton, sandy gravel, well-rounded gravel, well-sorted sand, muddy sand, and laminites. Two diamicton horizons are present: an upper brown clast-rich sandy diamicton, and a lower grey clast-poor muddy diamicton, the latter being only sporadically exposed by wave action. Sand and gravel occur in close association, as well as minor mud and gravel successions. The sedimentary succession at Tonfanau records the dynamics and deposition of both Welsh and Irish Sea Ice. The lowermost part of the exposed section records Welsh ice extending into Cardigan Bay, depositing a diamicton originating from the adjacent hinterland to the West. As the Irish Sea Ice Stream flowed south, it impinged upon the present coastline at Tonfanau, depositing sediment with a northern provenance on top of predominantly Welsh material, as indicated by clasts from the Irish Sea Basin, Anglesey and the Llŷn Peninsula. The depositional environment for the Irish Sea materials is interpreted as one where a fluctuating ice margin generated a grounding-line fan complex in an ice-contact lake that merged laterally with lake sediments derived from suspension and turbidity currents. Succeeding facies indicate over-riding by Irish Sea Ice. Finally, the upper few metres of the succession was subjected to cryoturbation under a periglacial climate. en
dc.format.extent 19 en
dc.language.iso eng
dc.relation.ispartof Proceedings of the Geologists' Association en
dc.subject Tonfanau en
dc.subject Welsh Ice Cap en
dc.subject Irish Sea Basin en
dc.subject Devensian en
dc.subject Grounding-line fan en
dc.subject Irish Sea Ice Stream en
dc.title Ice-marginal sedimentation associated with the Late Devensian Welsh Ice Cap and the Irish Sea Ice Stream: Tonfanau, West Wales en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1016/j.pgeola.2009.10.004
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Quaternary Environmental Change Group en
dc.description.status Peer reviewed en


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