The Conococheague Formation is a mapped Appalachian bedrock unit of Cambrian age, consisting primarily of limestone and dolomite.

The type section is located at Scotland in Franklin County, Pennsylvania (northeast of Chambersburg).

[4] These may be easily seen from the towpath trail of the Chesapeake and Ohio Canal National Historical Park along the Maryland bank of the Potomac.

In Shepherdstown itself, the top of a Conococheague cliff provides the setting for the monument to steamboat-inventor James Rumsey.

[5] Thrombolites and the possible chiton Matthevia are present in the Boxley Blue Ridge Quarry in Bedford County, Virginia.