We have one of these on a fake moonrock underwater, so I guess we'll just have to move it a bit.
Found this one buried in a rock by the Cherohala Skyway - apparently North Carolina has their own markers…
My dad worked for the USGS and installed a few hundred of these in the 70's. Cool to see them in the wild.
Man, this one hits me where I live ... or at least within several feet of it. I love these markers.
Oh my god they're defining the geoid by the local strength of gravity that's so rad
Always love seeing these out on walks (former real estate lawyer)
These markers can be way out of whack due to compounding errors. Five feet across the distances of state borders is actually insane precision for the tools of the times. The best I've ever managed was closing a 40 acre loop at 99.99% with optics, and that's not accounting for self correcting errors.