The rockart boulder known as Silsby’s Rock was published in Hranicky (2010) and is a large boulder with cupules and a design (Figure 9). It was moved from its original location to the Great Falls Park’s Visitors Center and is maintained by the National Park Service.
Silsby's Ethnographic Rock
Location: Loudoun County, Virginia
Wm Jack Hranicky RPA
rockart glyphs pictographs petroglyphs