is the land of spirals. Many of the petroglyphs
are of the meandering type seen on the right.
petroglyph on the left shows signs of being chalked.
Chalking accelerates the amount of environmental
degradation a petroglyph might suffer, and hampers
dating techniques as well. Visitors to the petroglyphs
are advised not to chalk or scratch the grooves
of a petroglyph.
a petroglyph by means other than altering the
light that falls on the surface of a boulder (or
by the use of special development techniques for
a photographic negative or the use of software
enhancement of the scanned image) is usually detrimental
to the work. See our Photographic
Techniques page for more.