Trace Fossils.
The Fort Rock Natural Area is a fascinating recent volcanic area < 200,000 years old located in south central Oregon. The region is high desert and very isolated as much as any part of the Basin and Range. An ancestor of mine ranched in the general area which is why I saw the location. It isn't anywhere that anyone would be likely to go. Thus, it interested me.
When they make Tubular Bells, it’s time to worry.
Micro-aggressive microbes.