Antietam Formation
| Antietam Formation Stratigraphic range: [Cambrian]] | |
|---|---|
| Type | Formation |
| Unit of | Chilhowee Group |
| Thickness | 550 ft |
| Lithology | |
| Primary | Sandstone, quartzite |
| Other | Schist |
| Location | |
| Region | West Virginia, Pennsylvania, Maryland |
| Country | United States |
| Type section | |
| Named for | Antietam Creek |
The Antietam Formation or Antietam Sandstone is a geologic formation in Pennsylvania, Maryland and West Virginia.[1][2][3] It is largely quartz sandstone with some quartzite and quartz schist. It preserves Skolithos trace fossils dating back to the Cambrian Period.[4]