Hi RombaldII

I coudn't believe my eyes when I saw your picutures of the "marked" stones.
This practice was abandoned 30 years ago for all the good reasons.
Chaulking-in the motifs is on top of every "don't"-list when it comes to the recording of prehistoric rock art.
It is sending out a very wrong message; what you do with (childern's) chaulk, could be easily done with crayons or, even worse, with paint.
Here are some points to consider:
- go when the sun is low;
- spray a little water when there is no sunlight;
- only brush away with a soft brush what the wind should blow away;
- leave the motifs as you found them.
Therefore I ask you strongly to stop this way of recording our already vulnerable prehistoric heritage.
Regards,

Jan Brouwer

"Rock Art in the British Landscape"
www.rockartuk.tk