Resting on bedrock within 30cms depth.
Links:
[1] https://www.hutton.ac.uk/staff/allan-lilly
[2] https://www.hutton.ac.uk/learning/exploringscotland/introduction
[3] https://www.hutton.ac.uk/learning/exploringscotland/soils
[4] https://www.hutton.ac.uk/learning/exploringscotland/soils/immaturesoils