Because it is childrens chalk which will have been washed off already by the first rain of which we have lots on Rombalds moor.
A simple photo does not show what is there.
I am following the methods used be Boughey et al as described in Prehistoric Rock Art of the West Riding p121. I may try to get the high tech version of chalk described there described
There is absolutely no way anyone will find these roocks without a GPS and a rough idea of what they are looking for. I have stood on top of a rock found with a GPS and wondered where that damn rock is until Uven with PRAWR in my hand, I have had to think hard about what I was looking at.
RombaldII
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