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The closest major Irish environmental archive is at Derryvree townland near Maguiresbridge, County Fermanagh, in the civil parish of Aghavea. Roadworks in 1969 cut through a drumlin and revealed a remarkable sequence: glacial till below, freshwater silts and fine sands containing organic matter in the middle, and further glacial deposits above. The ordering is secure even where the absolute dating remains broad. Ice had previously occupied the site; for a time, water and wetland vegetation accumulated in a basin; later glacier ice advanced across the locality and sealed the deposits beneath another till.
The closest Irish environmental evidence is the Derryvree freshwater deposit near Maguiresbridge, in the parish of Aghavea, County Fermanagh. Road works in 1969 cut through a drumlin and revealed organic silts and fine sands between two separate layers of till: unsorted debris deposited directly by glacier ice. The sequence shows, in secure relative order, an earlier glacial occupation, a subsequent interval in which fresh water and vegetation developed locally, and a later episode of glaciation or ice-proximal deposition which buried the evidence.
The closest and most revealing Irish environmental record is at Derryvree townland, near Maguiresbridge in south Fermanagh, within the historic parish of Aghavea. Roadworks in 1969 cut through a drumlin and exposed an extraordinary sequence: glacial till below, freshwater sands and silts with organic material in the middle, and later glacial deposits above. This order matters. It shows that ice had covered the locality, that an interval without local ice allowed water, plants and animals to occupy it, and that ice later returned and sealed the evidence.
