The Williamsburg anticline is a large fold involving the Mississippian Greenbrier Group in western Greenbrier County, West Virginia. The Greenbrier Group is a series of limestones that are known for their karst development. Extensive reverse faults in these limestones have been identified recently by the author as a result of field mapping and lidar analysis. Some of these reverse faults extend as much as 18 miles and involve stratigraphic displacement of over 200 feet. Many, but certainly not all, of the major reverse faults can be traced by a distinct line of sinkholes along regional strike.