The cliffs of Knockmore expose the massive carbonate mudbank facies. The many small cliffs to the southwest expose the bedded mudbank flank facies of the Knockmore limestone. These limestones generally dip gently to the south. The limestone pavements on Knockmore and on the bench running southeast towards Noon's Hole are the best developed pavements in Fermanagh with small areas of clints and grikes interspersed with vegetation growing on drift material. The pavement displays many classic 'Karren' features in addition to clints and grikes e.g. solution pans, solution pits and solution runnels. The bench also has a number of solution dolines (oriented on major fissures), potholes (e.g. Pollnamadda and Crinoid Cavern) and a line of small sinks fed from the sandstone uplands to the west.
At Legland the water from Pollaraftra rises and over a distance of 5m, sinks and rises again before flowing down a series of waterfalls and cascades. Above the rising, at the line of small cliffs, there are a number of detached limestone blocks with a boulder field below.
The fault on which the Pollaraftra valley is formed has a down throw to the south. It divides Knockmore from the limestone benches to the south. The resultant topography is a striking scarp slope with limestone cliffs on the north side of the valley and a less steep slope incised by stream valleys topped by small sandstone crags to the south. In the stream valleys are good exposures of the Dartry Limestone and overlying Formations. Exposures of the Meenymore Formation show bedding planes with well developed ripple marks.
