Two mostly complete trilobite from the lower Cambrian Latham Shale, California--specimens I did not collect, by the way. The image is courtesy an individual who goes by the cyber-handle Brett Breakin' Rocks. I edited and processed the image through photoshop. Called scientifically Mesonacis fremonti. Scale is in millimeters.

The Marble Mountains trilobite locality presently lies within Mojave Trails National Monument (officially authorized and established on February 12, 2016), where the BLM (Bureau of Land Management) continues to allow the casual collection of reasonable amounts of common invertebrate fossils--a designation that here includes trilobites; for fossil sites situated on private property, visitors must secure explicit permission from the land owners.