Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.651789
Title: The Loch Lomond stadial ice cap in Western Lochaber, Scotland
Author: Greene, Debbie
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 1995
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Abstract:
The aim of this thesis is to reconstruct the dimensions of the Loch Lomond Stadial (LLS) ice cap in Western Lochaber, Scotland, and to make inferences about ice cap dynamics on the basis of the field evidence. There have been no previous detailed studies of LLS ice cover in Western Lochaber, yet an accurate empirical reconstruction of the ice cap is an essential input and constraint to models of the interactions between climate, ice volume, topography and mantle rheology. Three different types of field evidence are used to reconstruct the ice limits. Firstly, geomorphological and sedimentary evidence indicates some lateral and terminal limits and retreat patterns. Secondly, a seismic stratigraphy of Loch Linnhe and the Firth of Lorne provides additional evidence for the distribution of glacial deposits and an ice limit. Thirdly, the glacial and periglacial evidence on 111 slopes marks trimline altitudes reflecting the palaeo-ice surface. These three types of evidence allow a three dimensional reconstruction of the ice surface. The ice cap was up to ˜650m thick, and ice flowed from the main mountain ridges and an ice plateau around the heads of Lochs Eil and Shiel, down the main troughs to the sea lochs. All available chronological controls support the proposition that this ice cap existed during the LLS. Depositional evidence suggests that subsequent ice retreat back towards the mountains was punctuated by stillstands at topographic pinning points in the sea lochs. There are distinct contrasts in the spatial distributions of glacial erosional and depositional evidence. Throughout the west and south of Western Lochaber terrestrial signs of glacial scouring are widespread and glacial till and moraine are thin and sporadic, yet there are thick glacimarine sequences in the proglacial submarine basin in Loch Linnhe, and large proglacial outwash fans around the lochs. In the north east of Western Lochaber and in Eastern Lochaber slopes are mostly mantled with glacial till, there are large terminal and lateral moraines and outwash deposits are common.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.651789  DOI: Not available
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