Description: This generalized Missouri-wide data set has been contoured to display the elevation in feet (relative to mean sea level) of the top of consolidated geologic formations that are older than Quaternary in age. In most locations the contour depicts the top of consolidated bedrock but in some locations (such as the Southeastern Lowlands) the material older than quaternary is poorly consolidated. For full documentation see http://dnr.mo.gov/GIS/GEOLOGY.TOP_ROCK_ELEV.XML , best when viewed in a separate browser window.