1. Geologic map of exposed Precambrian rocks, Des Arc NE quadrangle, Iron and Madison counties, southeast Missouri Yale Public content 1988. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Missouri, Iron County, and Madison County. Precambrian.