Stoned out of their minds, bored to death.
http://lovebunnies.luckypro.biz/01_stuff/04_galleries/2005-07_Tahoe/index.html
Feel free to google "grimes point" I realize this isn't UK Neolithic. Still...
Is the date range on the sign correct? 5000BC to 1000AD? Or is that just another way of saying we have no idea?
I know the australian aborigine paintings have a longer date range so its possible...