The Abbey Craig is the hill upon which the Wallace Monument stands, at Causewayhead, just to the north of Stirling, Scotland.The Abbey Craig is part of a complex quartz-dolerite intrusion or sill within carboniferous strata, at the western edge of the Central Coal Field, known as the Stirling Sill. The quartz-dolerite, being much harder than the surrounding coal measures, has been exposed due to erosion, including by glaciation.