- COORDINATES: 39.7969041, -76.7348531 (Believed approximate to where marker may have been.)
- COUNTY: York
- EXPLANATION OF NAME: Originally Rocks In Glen (This info comes from the marker's inclusion in a 1970 booklet by Clair Clawser.)
- FOUNDED: 1838
- MANUFACTURER: Undetermined
- STATUS: Believed to be long gone, markers here were known only from Clair Clawser book. A replica marker was found on wall of borough building by G. Smith, Feb. 2016. A real marker has turned up as of May 2026 is displayed in the borough office. The boro has plans to install it at some public place.

Feb. 2016 photo by G. Smith

Photo of town Mural that includes the now long gone Keystone Marker

May 2025 photo by boro.
Original site likely on PA Route 216