(Blog updated June 6, 2025.)
If you hike in the Sandia Mountains, you may have encountered a tree with a small aluminum disk at eye height. The disk provides an approximate germination date ("GD") and a contemporary event in world history. For example, the disk shown above occurs on the pinyon pine shown below. The pinyon is on the crest of the Sandias and you're likely to pass it if you hike from the crest parking lot to North Sandia Peak.
The website that provided the list apparenly no longer exists, so I'll provide a downloadable copy below. As time goes on the medallions are disappearing, so don't be surprised if you hike to the location for a disk and can't find it.
