The bedrock of the islands of Lewis and Harris dates back about 3 billion years and is among the oldest in Europe. According to Wikipedia these rocks are largely igneous in origin, mixed with metamorphosed marble, quartzite and mica schist and intruded by later basaltic dykes and granite magma.
Location: On the “moonscape” east coast of the Isle of Harris, a few miles south of Finsbay on the road to Rodel, Outer Hebrides, Scotland, UK.
Nikon D7000, Nikkor 18-200mm. Captured in RAW, converted to JPG and post-pro adjustment of sharpness and contrasts in CS4 with NikColorEfex.