Caughey Presentation

An Investigation of the Quaternary Galtrim Moraine System using geophysical and remote sensing techniques.

Helen M. Caughey1, 2, Paul J. Gibson1

1Dept. of Geography National University of Ireland, Maynooth; 2National Centre for Geocomputation National University of Ireland, Maynooth.

This work sets out to ultimately reconstruct a model of the glacial past of Ireland centred around Galtrim, Co. Meath. This is a hugely important area comprising a complex system of depositional features of the late Quaternary period in Ireland. Moraines formed at the margins of the ice sheet in a NE-SW alignment and locate an area where there was a temporarily stabilised halt in the recession of the ice. It is also associated with well defined esker systems and related to pro-glacial Lake Summerhill where delta moraines formed. Much of the research in this area and indeed on much of the glacial deposits in Ireland has been largely from a geomorphological point of view. The reconstruction of the glacial evolution in this region and the subsequent deglacial processes are greatly constrained because of the lack of 3–dimensional morphology for this area and furthermore because sedimentalogical studies have not been conducted in this area due to lack of exposure. In order to address these challenges in trying to recreate an inclusive model for this period, techniques which have been used only sparingly so far in investigations of this nature in Ireland will be implemented and combined. Geophysical investigations and remote sensing analysis are discussed in terms of their usefulness and expected value. Preliminary results of resistivity and ground penetrating radar fieldwork are examined with particular reference to training sites including forward modelling and initial time lapse resistivity work. Plans and ideas for continued work on the area are introduced and discussed.

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