jbatey
If the deed says upright rock that is what a surveyor is gonna look for. Look on top of the rock. Is there any sort of punch hole or x scribe? If there is evidence of old flagging on any of these corners you find I would put some new flagging on it every few years. Always keep it fresh. Some folks will drive tpost beside corner and flag corner and tpost.
Gotcha, once I know where they all are, I’ll make it a good practice to just revisit them every year or so to put up fresh paint and flagging.
