The Broxton Rocks Preserve, located in northern Coffee County, Georgia, is owned by The Nature Conservancy (TNC). It occupies a portion of the Atlantic Coastal Plain where Miocene strata dip gently eastward. "The Rocks" are erosional remnants of the Altamaha Formation, and exhibit outcrops that are up to 6 m high that contain numerous sub-vertical and vertical joints. Erosion has widened a few of the joints in excess of a meter. Four joint orientations are dominant: two major sets, 1) 015°-195° +/- 15° (NE-SW set) and 2) 095°-275° +/- 15° (E-W set), and two minor sets 3) 130°-310° +/- 10° and 4) 155°-335° +/- 10° (NW-SE set). The large joints on the topographic surface show that the E-W joints (095°-275°) are older than a weak N-S set (355°-175°), while the NW set (155°-335°) appears to be the oldest set. Rocky Creek, a first-order ephemeral stream, dissects part of the outcrops and flows in a rectilinear pattern from its knick point at Rock Falls. Orientations of the stream channel segments mimic those of the joints, but with a more dominant NW-SE trend (155°-335°).
Broxton Rocks contains over 500 species of plants; some are very rare. Though the outcrops are dominated by longleaf pine and numerous xeric species, the range of microclimates provided by the different joint sets is conducive to the growth of such unusual plants as filmy ferns, shoestring ferns, and green-fly orchids. Diverse animal species inhabit the varied landscape as well, including gopher tortoises, indigo snakes, eastern woodrats, flying squirrels, and a variety of birds. Both the geology and natural communities of Broxton Rocks are unusual in southern Georgia.