Boulder Edge-roundness as an Indicator of Relative Age: a Lochnagar Case Study.
A method is presented for quantifying the degree of edge roundness of large crystalline boulders using a simple instrument. The method utilises the transition due to granular disintegration from sharp to rounded boulder edges, so that the degree of edge roundness is a function of time and can be use...
| Publicado en: | Scottish Geographical Journal Vol. 121; no. 2; pp. 219 - 237 |
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| Formato: | Artículo |
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Taylor & Francis Ltd
Jun2005
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=20726240&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 20726240 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 14702541 8NB jtl: Scottish Geographical Journal issn: 14702541 maglogo: N pubinfo: dt: Jun2005 vid: 121 iid: 2 pid: 377 pub: Taylor & Francis Ltd artinfo: ui: 20726240 10.1080/00369220518737232 ppf: 219 ppct: 18 formats: fmt: @attributes: type: P size: 4.9MB tig: atl: Boulder Edge-roundness as an Indicator of Relative Age: a Lochnagar Case Study. aug: au: Kirkbride, Martin P. affil: Department of Geography, University of Dundee, Dundee DD1 4HN su: Boulders Geochronometry Geography Glaciers Moraines Glacial landforms Scotland sug: subj: Scotland Boulders Geochronometry Geography Glaciers Moraines Glacial landforms keyword: Caimgorms Weathering Dating Younger Dryas ab: A method is presented for quantifying the degree of edge roundness of large crystalline boulders using a simple instrument. The method utilises the transition due to granular disintegration from sharp to rounded boulder edges, so that the degree of edge roundness is a function of time and can be used as a relative dating tool. Edge roundness can be precisely measured in the field if strict morphological criteria are adhered to when selecting boulders to measure. Roundness can be expressed as a length measurement between fixed points on adjacent facets, as a normalised index, or as a radius of curvature. Boulder edge-roundness was employed to resolve uncertainty over the extent of the ‘Loch Lomond Stadial’ (LLS) glacier in the North-east Corrie of Lochnagar. Small but significant differences in edge roundness between two sets of moraine ridges indicate that the LLS glacier was smaller than that mapped by Sissons & Grant (1972). The moraine they ascribed to the LLS relates to an earlier advance within Late Devensian time. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y custom: Copyright of Scottish Geographical Journal is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. item: Scottish Geographical Journal holder: Taylor & Francis Ltd dt: @attributes: year: 2005 holdings: @attributes: islocal: N |
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