Nine cross-valley moraines in the 3km length of the Moygannon River valley are broad (<200m), rounded and discontinuous. There are frequent meltwater breaches in frontal moraines. A longitudinal ridge at Ballymaconaghy [J158 203] measures less than 1km long, less than 300m wide and less than 15m high. It is bounded in the east by the underfit Moygannon River and in the west by a minor stream. The ridge consists of around 4 poorly marked cross-valley frontal moraines which are more clearly defined on the valley sides as discontinuous round-crested ridges and benches. Minor exposures indicate that the ridge contains gravely diamict. Lateral moraine benches and subdued hummocks trend northward along the flanks of streamlined hills on the western side of the valley. Two well-marked cross-valley arcs at Aghavilly have sharply defined, steep, distal and proximal slopes.
