Peedee Formation

The Peedee Formation is a geologic formation in North and South Carolina. A marine deposit, named for exposures along the Great Peedee River, it preserves belemnites and foraminifera fossils dating from the Late Cretaceous.[1] The formation is notable for its occurrence of Belemnitella americana, known as the Pee Dee Belemnite (PDB), a long-standing standard in stable carbon isotope research.

Peedee Formation
Stratigraphic range: Late Cretaceous
Fossil bivalve from the Peedee Formation (South Carolina)
Type	Formation
Overlies	Black Creek Formation
Thickness	Up to 886 ft (270 m)
Lithology
Primary	Glauconitic to argillic sandstone
Other	Claystone, limestone
Location
Region	North & South Carolina
Country	United States
Type section
Named for	Pee Dee River, type locality: Burches Ferry, South Carolina[1]