The Livingston fault zone is restricted to the outcrop of the Selma Chalk of upper Cretaceous age in Sumter and Marengo Counties, Alabama. This zone is unique among Gulf Coastal Plain structures in that it contains many horsts and grabens which are bounded by reverse faults. These faults dip both to the northeast and southwest and strike North 70 degrees West with a mode for fault plane dip of 40 degrees to 45 degrees.