Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication (hierarchy name)
4. Visual Works (hierarchy name)
5. visual works (works)
6. [visual works by material or technique]
7. petroglyphs

Anotations

Scope note:

Boulders marked with deep, parallel furrows. There is no consensus as to the reason for these grooves, but it is possible that these rocks were used to polish stone tools in prehistoric times, or as timekeeping marks.