q - What are the holes in the rocks and what caused them ?
A- Pit cairn is the small cup-shaped depressions. It is thought that these pits form beneath colonies of algae, lichen and moss. As the plants grow they release acids that dissolve the bedrock to get nutrients. Waves, fires or other processes can remove the plants to expose the pits. Some of the best pit karren can be seen near the lake’s edge.