The Williamsburg Formation is a geologic formation in South Carolina consisting of sandy shale and clayey sand.Williamsburg Formation at Fossilworks.org 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.
See also List of fossiliferous stratigraphic units in South Carolina Paleontology in South Carolina
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