Patuxent Formation
| Patuxent Formation | |
|---|---|
| Stratigraphic range: | |
. View at School House Hill, Baltimore County, Maryland showing the Patuxent Formation overlain by the Arundel Formation | |
| Type | Sedimentary |
| Unit of | Potomac Group |
| Underlies | Arundel Formation |
| Overlies | Basement |
| Thickness | up to 250 feet (80 m) |
| Lithology | |
| Primary | Sandstone, claystone, gravel |
| Other | Siderite |
| Location | |
| Region | Atlantic coastal plain |
| Country | United States |
| Extent | Maryland, Washington D. C., Delaware, Virginia |
| Type section | |
| Named for | Patuxent River |
| Named by | W. B. Clark, 1897 |
The Patuxent Formation is an Early Cretaceous (Aptian)-aged geologic formation of the Atlantic coastal plain. It is part of the Potomac Group.