When you think of rocks in a driveway or by a river, you typically are thinking of gravel — irregular shapes, sizes, colors, and materials, all mixed together.

Limestone Pavements are bare limestone rock surfaces composed of slabs of rock (clints), separated by variable-width vertical cracks (grikes) . These grikes have developed by weathering and ...

The habitats in these grikes are important for conservation, since limestone pavements only cover an area of around 28km² across Great Britain, equivalent to the size of a small town.