Geomorphological mapping, exposure lithostratigraphic analysis, borehole logging and particle size distribution analysis data com- bined with ERT and GPR data allowed the lithological and sedimento- logical characterisation of the subsurface. ERT data collected with three different electrode spacings supported the lithological charac- terisation of unconsolidated sediments and allowed estimating the depth to bedrock. GPR proved invaluable at depicting the internal ar- chitecture of low-loss materials such as esker gravel and glaciolacus- trine sediments. Using a range of antenna frequencies resulted in the detection of the subsurface internal architecture at different scales. The radar facies approach used for data interpretation allowed pat- terns encountered in the radargrams to be related to sedimentologi- cal properties of the subsurface. ERT and GPR data complemented each other and together provided a broad understanding of the sub- surface geology. The integration of these techniques with field and laboratory data permitted the geological characterisation of the site and the reconstruction of the depositional environment. The data presented suggest deposition of the recorded facies by an ice sheet retreating westwards. Firstly, diamicton was deposited subglacially over limestone bedrock. A continuous tunnel fill esker ridge (Geashill Esker) was then deposited overlying the diamicton under subglacial conditions infilling a subglacial meltwater channel running east. A subaqueous fan, indicating a lake water table of over 72 m OD, was deposited parallel to the continuous tunnel fill as a long beaded esker ridge composed of silt, sand and gravel overlying the subglacial diamicton. Glaciolacustrine silts and clays were subsequently depos- ited on the lower ground between the esker ridge and the fan at a later stage of deglaciation. Furthermore, peat developed during post-glacial times in a lake covering parts of the study area and extending north from the esker ridge, peat deposits in the study area were subsequently cut-away by anthropogenic activity.