1. Bedrock geologic map of the St. Louis 30ʹ x 60ʹ quadrangle, Missouri and Illinois Yale Public content 1997. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Missouri, Saint Louis Region, Illinois, and East Saint Louis Region.