| 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 |
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]
- ^ Weems, Robert E.; Olsen, Paul E. (1997-02-01). "Synthesis and revision of groups within the Newark Supergroup, eastern North America". GSA Bulletin. 109 (2): 195–209. doi:10.1130/0016-7606(1997)109<0195:SAROGW>2.3.CO;2. ISSN 0016-7606.
- ^ Weems, Robert E.; Tanner, Lawrence H.; Lucas, Spencer G. (2016). "Synthesis and revision of the lithostratigraphic groups and formations in the Upper Permian?–Lower Jurassic Newark Supergroup of eastern North America". Stratigraphy. 13 (2).