A new investigation of the stone age rock art panel at Hendraburnick Quoit in Cornwall, southwest England, found nearly ten times the number of markings when viewed in moonlight or very low sunlight from the south east. The researchers also discovered that pieces of white quartz which would have reflected moonlight or firelight had been deliberately smashed up around the site.
     Study leader Dr Andy Jones, of the Cornwall Archaeological Unit says: "I think the new marks show that this site was used at night and it is likely that other megalithic sites were as well. We were aware there were some cup and ring marks on the rocks but we were there on a sunny afternoon and noticed it was casting shadows on others which nobody had seen before. When we went out to do some imaging at night, when the camera flashed we suddenly saw more and more art, which suggested that it was meant to be seen at night and in the moonlight. Then when you think about the quartz smashed around, which would have caused flashes and luminescence, suddenly you see that these images would have emerged out of the dark. Stonehenge does have markings, and I think that many more would be found at sites across the country if people were to look at them in different light."
     Hendraburnick Quoit is a large propped 'axe-shaped' stone that was set upon a low platform of slates on Hendraburnick Down, near Davidstow, around 11 kilometres east of the promontory site of Tintagel Castle. Dr Jones believes the stone was dragged up from the valley in the Late Neolithic or Early Bronze Age, around 2,500 BCE.
     Previous studies had recorded 13 cup marks, but Dr Jones and colleague Thomas Goskar found 105 engravings under low-angled light, which now makes it the most highly decorated and complex example of rock art known in southern England.

Edited from The Telegraph (7 July 2017)