Stonehenge and its Environs 134
Image by Chance

tonyh wrote:
Talking of vegetation. It's not just the ground that has to been considered. moving a load through brushwood or woodland would be extremely difficult..

Tony

Since we are not talking about a wide swathe of land for dragging stones it would likely that some time would be spent preparing a decent route beforehand -- trees felled, brush cleared, streams forded, etc.