CENOZOIC REACTIVATION OF THE NORTHERN BORDER OF THE SOUTH GEORGIA RIFT BASIN (PRINGLETOWN FAULT)

New seismic data collected 60 km northwest of Charleston, SC image the northern boundary of the South Georgia Rift Basin, herein named the Pringletown Fault. The Pringletown fault, which is inferred from aeromagnetic and gravity anomalies, is part of the northern border fault system of the South Georgia Rift Basin, a Triassic Rift basin buried beneath the coastal plains of South Carolina, Georgia, and Florida. Seismic reflection data was collected in the vicinity of Four Holes Swamp to determine if the fault was active in the Cenozoic. Results of the survey show minor offset in strong reflections between 50 and 150ms, which are interpreted as the Eocene Santee Limestone, as well as offset in a strong reflector at 600ms, which is interpreted to be a Jurassic age basalt, locally referred to as the J-reflector. Borehole data collected in this area through the Eocene and younger units reveals some changes in lithology coinciding with the Pringletown fault, and indicate the faulting may be of Paleocene age or younger.