The complex of eight dome shaped Tumulus burial mounds was in use during the Miller 1 phase of the Miller culture and was built between 1 and 200 CE. It is considered to be one of the largest and most important sites from this era. It was listed on the National Register of Historic Places in 1978 as part of the Natchez Trace Parkway at milepost 286.7.
The site is located at the headwaters of the Tombigbee River, a rugged, hilly area with many broad, swampy streams. It is named for "Pharr Flats", a wide gently rolling terrace overlooking the confluence of Little Brown and Mackeys Creeks. The site features eight dome-shaped mounds of differing sizes, several of which have been nearly flattened by European American farming. The mounds in the Pharr Mounds site are scattered over 90 acres of land.
In 1966 Robert Carr, an archaeologist for the National Park Service, led an excavation of four of the mounds. The excavators found fire pits and low clay platforms at the base of the mounds. They also found human remains, some cremated, as well as various exotic ceremonial artifacts.
Many of the artifacts were made from nonlocal materials such as Great Lakes copper and greenstone, galena, and mica that were obtained through the Hopewell exchange system. These artifacts, which include copper ear-spools and a greenstone platform pipe, show the connection of the local peoples with the larger Middle Woodland period world of the time.