A number of landslides are recorded within the park. Amongst the more spectacular is that at Craig Cerrig-gleisiad. This L-shaped cwm was thought to be entirely glacial in origin until the 1990s but it is now recognised that a significant long runout landslide occurred here with the failure of the glacially over-steepened western wall of the cwm, some time after the main glacial but before the Loch Lomond Stadial. Some 'rucking' of slipped masses of bedrock appears on the hillside to the north of this feature, the result of a separate bedding plane slide.