This is a booklet written to accompany the 1:50 000 scale geological map of Scotland published by BGS. It takes the form of a factual account of the geology. Sheet descriptions and Sheet explanations are gradually being introduced in place of memoirs. Sheet explanations give a concise account of a geological sheet district in the form of an A5 sized booklet. Many are available in a pack with the accompanying map. Sheet descriptions contain additional, more detailed information and are produced as print-on-demand (POD) A4 reports or on CD.