Geograph - photograph every grid square

On the right are two lava flows. The lower one is barely visible at the foot of the cliff, which forms the upper one. Under the overhang is a layer of laterite. Laterite forms by weathering of soil in tropical climates, and is an important source of bauxite, the ore from which aluminium is extracted. This layer was formed in the Carboniferous when Scotland lay close to the Equator. It shows that there was a long interval of time between the two lava flows.