Patapsco Formation | |
---|---|
Stratigraphic range: | |
Type | Formation |
Unit of | Potomac Group |
Underlies | Raritan Formation |
Overlies | Arundel Formation |
Thickness | 200 feet (60 m) |
Lithology | |
Primary | clay, sand |
Other | silt |
Location | |
Region | Virginia Maryland |
Country | United States |
Type section | |
Named for | Patapsco River |
Named by | William Bullock Clark (1897)[1] |
The Patapsco Formation is a geologic formation of varigated clays, sandy clays, and sand in Virginia, the District of Columbia, Maryland, Delaware, Pennsylvania, and in the subsurface of New Jersey.[1][2] It preserves fossils such as plants and molluscs dating back to the Cretaceous period.[1]