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(Article of periodic en Anglais - 2014)

Document title

Subglacial hydrology and drumlin sediments in Connemara, Western Ireland

published at : Glacial and paraglacial environments

Authors(s) and Affiliation(s)

KNIGHT J. (1) ;
(1) School of Geography, Archaeology and Environmental Studies, Univ. of Witwatersrand, Johannesburg, AFRIQUE DU SUD

Abstract

This paper describes the internal sediments from 2 significant drumlin exposures at Ardmore and Ballyconneely, west County Galway. Both drumlins show a lowermost lithofacies association comprising overconsolidated subglacial diamicton with clast lithology, strong fabrics and overfolds indicative of regional east/southeast to west/northwest late Weichselian ice flow. This lithofacies association is overlain at both sites by west-dipping, stratified, graded gravel and diamicton beds that downlap onto laminated silts. These beds reflect episodic debris flows into a leeside cavity developed following creation of relief by deposition and deformation of a subglacial diamicton nucleus located up-ice. Variations in substrate hydrological processes are identified in both drumlins. These features reflect the close connection between subglacial hydrological and sedimentary processes and their changes over time as the drumlin form develops

Source

Thematical fascicle

published at : Geografiska annaler. Series A. Physical geography / ISSN 0435-3676 / CODEN GAPGAP

Editor : Svenska sällskapet för antropologi och geografi, Stockholm - SUEDE (1965)

Millesime : 2014, vol. 96, no 3 [pp. 403-415]

Bibliographic references : 2 p.

Collation : fig., tabl.

Language

Anglais

INIST-CNRS, Cote INIST : 2704 A

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1111/geoa.12039

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2014
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