I reviewed Hamberlinmark's post on Idud.

Hamberlinmark reports that the road Hollund built is constructed of log buckings and river rock. Log buckings are cut timber or trimmings from cut timber, and river rock is common rounded rock found just about anywhere. This seems reasonable to me. While I can’t speak to his honesty, I would say his description is spot on for what would be expected in this part of the world.  Since Hollund had to cut through dense jungle to arrive at the lake site, it is reasonable to assume that trees were available for bucking.  His description of hardwood sales is also spot on.  At the very least, he has a reasonable grasp of the timber industry in my opinion.