Entire specimen: Trilobite Free Cheek Genal Spine with metric scale

So far I’ve only collected Pygidium parts and perhaps a Thorax piece from local fossil trilobites. Yesterday August 6th, 2020, I found my first confirmed portion of what I’m fairly sure is the Free Cheek of a local Trilobite. These are held together tightly during life, and easily become dislodgedRead More →

This trilobite tail, also known as a pygidium was embedded in Brush Creek Limestone. By the Carboniferous, trilobites were on the decline, and evolution was making them smaller and smaller. Only the order Proetida survived into the Carboniferous, and later died out at the end of the Permian. It wouldRead More →