Chatham Group

The Chatham Group is a Triassic-age geologic group in the eastern United States. It is one of the most fossiliferous sections of the Newark Supergroup, preserving much of the Late Triassic up until the Triassic-Jurassic mass extinction. The group was originally named to refer to Triassic rocks (the Pekin, Cumnock, and Sanford formations) specifically within the Deep River Basin of North Carolina. Later studies have utilized it to encompass Late Triassic strata in most other sedimentary basins in the Newark Supergroup.^[1][2]

Chatham Group
Stratigraphic range: Triassic
Type	Group
Unit of	Newark Supergroup
Sub-units	Doswell Formation, Stockton Formation, Lockatong Formation, Passaic Formation, Manassas Sandstone
Underlies	Meriden Group
Overlies	Acadia Group
Location
Region	Eastern United States
Country	United States