Abstract
Abstract This paper describes the portrayal of the surface distribution of Quaternary deposits (drift) in a range of maps prepared by the Geological Survey (Scotland). It considers three methods of classification involving the use of 1. the familiar BGS symbol scheme, 2. the descriptive lithological codes of thematic map packages and 3. an alphabetical Classification adopted in a recent thematic study of the Clyde valley. The three dimensional distribution of Quaternary deposits has rarely been portrayed in map form. A lithological profile scheme, also prepared as part of the Clyde valley project, is advocated as an appropriate method of representing the third dimension in complex sequences.
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