Lomond Hills: The Lomond Hills contain two prominent peaks, West Lomond and East Lomond (or Falkland Hill) (448 m), which lie at either end of an escarpment roughly 6.5 km in length. The escarpment, made from beds of sandstone, limestone and quartz-dolerite, rises gradually from the south to a plateau of around 350 m in height between the peaks of East and West Lomond. To the north and west, this plateau terminates in steep and, in places, cliffy scarp slopes. From its western end, the escarpment continues southwards beyond the deep valley of the Glen Burn (Glen Vale) to Bishop Hill (461 m). The steep-sided peaks of East and West Lomond themselves are volcanic in origin. Along the edges of the sandstone bed at the foot of the scarp slopes are several strangely eroded outcrops, the most famous of which are the Bunnet Stane and John Knox's Pulpit, so named because it is believed to be a spot where covenanters held conventicles in the 17th century. There are also strange outcrops in the columnar jointing at the edge of the dolerite sill on Bishop Hill, most notably Carlin Maggie.