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dc.contributor.authorGlasser, Neil F.
dc.contributor.authorRoman, Matej
dc.contributor.authorHolt, Tom O.
dc.contributor.authorŽebre, Manja
dc.contributor.authorPatton, Henry
dc.contributor.authorHubbard, Alun Lloyd
dc.date.accessioned2020-06-15T10:55:15Z
dc.date.available2020-06-15T10:55:15Z
dc.date.issued2020-05-30
dc.description.abstractAbrasion and quarrying are significant processes of subglacial erosion for ice masses in direct contact with hard substrates, yet their relative efficacy and spatio-temporal variability is unclear. Here, we investigate the glacial impact of these processes on a 70 m by 60 m bedrock surface at Moel Ysgyfarnogod in the Rhinog Mountains, Wales, using a combination of high-resolution digital photographs, analysis of a Digital Terrain Model derived from an Unmanned Aerial Vehicle survey, and regional ice sheet modelling. We map and analyze the distribution of grooved and striated surfaces, abraded surfaces, quarried blocks and open fractures in addition to the orientation of pre-existing bedrock fractures and joints. The grooves and striations are orientated in a single, consistent direction across the bedrock surfaces related to regional ice flow during the Late Pleistocene. Abraded and smoothed bedrock dominates the proximal edges of the bedrock outcrop and quarrying prevails on the distal edges of the bedrock outcrop, which are dominated by detached and partially detached blocks. We propose these blocks were removed during the final stages of the last glacial cycle when subglacial meltwater was plentiful in this otherwise predominantly frozen subglacial setting. A minimum estimate of 2000 m<sup>3</sup> displaced material at this site implies that subglacial quarrying would have been an important erosional process during final stages of deglaciation.en_US
dc.descriptionAccepted manuscript version, licensed <a href=http://creativecommons.org/licenses/by-nc-nd/4.0/> CC BY-NC-ND 4.0. </a>en_US
dc.identifier.citationGlasser NF, Roman, Holt TO, Žebre, Patton H, Hubbard AL. Modification of bedrock surfaces by glacial abrasion and quarrying: Evidence from North Wales. Geomorphology. 2020;365:1-10en_US
dc.identifier.cristinIDFRIDAID 1814993
dc.identifier.doi10.1016/j.geomorph.2020.107283
dc.identifier.issn0169-555X
dc.identifier.issn1872-695X
dc.identifier.urihttps://hdl.handle.net/10037/18538
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalGeomorphology
dc.relation.projectIDNorges forskningsråd: 223259en_US
dc.relation.projectIDAndre: LM2015078en_US
dc.relation.projectIDAndre: CZ.02.1.01/0.0/0.0/16_013/0001708en_US
dc.relation.projectIDAndre: MUNI/A/1356/2019en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holder© 2020 Elsevier B.V. All rights reserved.en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450en_US
dc.titleModification of bedrock surfaces by glacial abrasion and quarrying: Evidence from North Walesen_US
dc.type.versionacceptedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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