Sarsen Stones of Stonehenge: How and by what route were the stones transported? What is the significance of their markings?
Hill PA.[Science. 1961] - PubMed - NCBI:
A route via Lockeridge and the Avon Valley, involving a slide down the chalk escarpment, is postulated for the sarsen stones of Stonehenge. The transportation problem would have been greatly simplified if the stones had been relayed from point to point over snow or slush during successive winters. Markings on the stones hitherto undescribed are interpreted.