Williamsburg Formation

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.