At the first area,after you hold the line at the "cannon" outpost,there are a ton of cutted tree trunks (at the beginning i thought them for spider web) were the only thing visible is the top of the trunk were it was cut down and not the roots etc...Also some of them are cliped into barrels and at the stone of the ruins of that area.

Hello! It seams nature have evolved bit strangely....! Tree trunks are still missing..got a nice screen shot but it seams i can not upload it here....At least they look like brown spider webs!!