Summary of site:
On either side of the Owenrigh River where it emerges from its confined valley below Mount Prospect, there is a substantial sediment body almost 60m thick. The sands and sandy gravel beds have internal inclines (foresets) of around 18º, sloping to the north east. They were originally a single mass, now divided into two fragments by a meltwater channel and the modern river. A ridge 500m long extends north-west/south-east from Banagher Church into these deposits.
When the last ice sheets were retreating, ice tunnels fed sediments in torrents of fast-flowing meltwater into a lake here, confined behind an ice dam. The lake surface was about 122m above modern sea level.