Lead-climbing is also discouraged for reasons of conservation - it is unacceptable for climbers to risk further damage to the thin rock crust on the surface of the crags. Unconsolidated and friable sand lies beneath this crust. Deep rope-grooves can be seen in places at Harrison's Rocks and are testament to the fragility of the rock.
Lead-climbing is also discouraged due to conservation concerns - it is unacceptable for climbers to jeopardize further damage to the fragile surface rock on the crags. Unstable and prone-to-erosion sand lies beneath this crust. Visible rope-grooves at Harrison's Rocks serve as evidence of the rock's susceptibility.