Extent of available data.
This data layer is a compilation of 100,000 scale Bedrock Maps from the Minnesota Geological Survey County Atlas products published since 1995. Because the county maps were created by different authors over a long time period, the feature edges of each county map do not always align with adjacent map edge boundaries. However, the compiled attributes of map labels and descriptions provide a common index of bedrock geologic units and allow for interpretations to be made between counties. This dataset is intended to be updated as new county mapping is completed. Bedrock geology forms the foundation upon which many other natural resource features of Minnesota are built.