The Antietam Formation or Antietam Sandstone is a geologic formation in Pennsylvania, Maryland and West Virginia.

It preserves Skolithos trace fossils dating back to the Cambrian Period.

[5] This article about a specific stratigraphic formation in West Virginia is a stub.

You can help Wikipedia by expanding it.This article about a specific stratigraphic formation in Pennsylvania is a stub.

You can help Wikipedia by expanding it.This article about a specific stratigraphic formation in Maryland is a stub.