I found this gem while walking a train track in Houston, MS around 1980. The gravel used to construct the railway was obviously all from the same quarry. Where? I don't know. I have no idea the species of trilobite, the formation it's from, or even it's material composition. I went back to that same place as an adult, but the railroad no longer exists and the rocks are all gone.
Kinda spooky how he peers at you from over 350,000,000 years. Wow!