>One man can gather and lay stones for dry stone walls but moving those large stones takes several men to make a smaller enclosure in more time.<

"Yes, I agree, but that is based on the assumption that both materials are available at the same site. If you only have one or the other you don't really have much choice."

So would you concede that Castlerigg (lots of good walling stone round there) is unlikely to be a corral ?

cx