BIRM-166’s Fermanagh Drumlin
During roadworks in 1969, an exposure cut through a drumlin at Derryvree. Beneath the rounded glacial landform lay two thick sheets of till, the unsorted sediment deposited by moving glacier ice. Between them were freshwater silts, fine sands and organic muds. The sequence is crucial: an earlier glacial episode had laid down till; a period followed in which standing or slow-moving fresh water, vegetation and organic matter accumulated; later ice buried the deposit beneath another till sheet.