The Belfast Telegraph reports that “a detailed laser-scan survey of the entire monument has discovered 72 previously unknown Early Bronze Age carvings chipped into five of the giant stones.
All of the newly discovered prehistoric art works are invisible to the naked eye – and have only come to light following a laser-scan survey which recorded literally billions of points micro-topographically on the surfaces of the monument’s 83 surviving stones. In total, some 850 gigabytes of information was collected.
Detailed analysis of that data – carried out on behalf of English Heritage – found that images had been engraved on the stones, normally by removing the top 1-3 millimetres of weathered (darker coloured) rock, to produce different sized shapes. Of the 72 newly discovered images revealed through the data analysis, 71 portray Bronze Age axe-heads and one portrays a Bronze Age dagger.
Prior to the laser survey, 46 other carvings (also of axe-heads and daggers) were known or suspected at Stonehenge – mostly identified visually back in the 1950s. The laser-scan survey has now confirmed the existence of those other images and provided more details about them.
The 72 new ‘rock art’ discoveries almost treble the number of carvings known at Stonehenge – and the monument’s largely invisible art gallery now constitutes the largest single collection of prehistoric rock carvings in southern Britain. Although now largely invisible to the naked eye, back in the Early Bronze Age the images, composed of then-unweathered (and therefore lighter coloured) stone would have been clearly visible.”
Read on at The Belfast Telegraph.