"in the case of stones that are too large to move", yes. Other stones are smaller, mentioned at sizes of 3.5 or 2.8-3.1cm each, an easy size to carry. Not knowi

"in the case of stones that are too large to move", yes. Other stones are smaller, mentioned at sizes of 3.5 or 2.8-3.1cm each, an easy size to carry. Not knowing much about the area they were used in, I'd say the quantity (6000 or so according to the article) is more limiting.