The Williamsburg Formation is a geologic formation in South Carolina consisting of sandy shale and clayey sand. It is a member of the Black Mingo Group and overlays the Rhems Formation. It preserves fossils, among others coprolites, dating back to the Paleogene period.
Fossil content
The following fossils were reported from the formation:
Mammals
Ectoganus gliriformis
E. lobdelli
Mingotherium holtae
Reptiles
Agomphus pectoralis
A. aff. alabamensis
Osteopygis emarginatus
Trionyx virginiana
Adocus sp. ?Bothremys sp. Chelonioidea indet. Cheloniidae indet. Pelomedusoides indet. Taphrosphyini indet. Toxochelyinae indet.
Crocodylians
Bottosaurus sp. Hyposaurus sp. Thoracosaurus sp. Eusuchia indet.
Snakes
Palaeophis sp.