With the exception of the post by "oneoldman", all of the photos seem to be of the Reference Mark #2. Anyone find the true benchmark? Since it is a triangulation station, it would have a small triangle in the center of the disk. The arrow on the #2 disk points to it. Should be close. There should also be a disk with #1 and an arrow, probably 90 degrees from #2.
I am planning a trip to Enchanted Rock in the near future. Haven't been there since the 70's. New to geocaching, but have been benchmark hunting as a volunteer to NOAA for years.