Subglacial hydrology and drumlin sediments in Connemara, Western Ireland

Glacial and paraglacial environments

Auteur(s) et Affiliation(s)



Description :
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.


Type de document :
Article de monographie

Source :
Geografiska annaler. Series A. Physical geography, issn : 0435-3676, 2014, vol. 96, n°. 3, p. 403-415, nombre de pages : 13, Références bibliographiques : 2 p.

Date :
2014

Editeur :
Pays édition : Suede, Stockholm, Svenska sällskapet för antropologi och geografi