The dataset has been created by combining, generalizing and vectorizing information from maps of bedrock and Quaternary sediments of at 1:200 000 and 1:50 000 scales. The areas depicted on the map correspond in age, genetic type and lithological composition to the sediments and rocks lying directly under the topsoil layer. In other words, the map shows the distribution and composition of Quaternary sediments, including small alvar areas with bedrock outcrops.