What I am trying to figure out is what is the blackish boom-a-rang shape in between the thorax segment and cephalon pieces? Maybe it is not even part of this trilobite since it is a different color.
It was found in Carroll County, Kentucky in the Kope Formation.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgRNlEDHbKoe2JFsA4IklJp0Whx8pMWeJdH8O3v3mB_e0S0Tw1FFLyjwF8qvxdqIevPYPyJgYuvzWAg5NBD4YkUDnEoCGhL7p2-MCBoYUMenJHtwnvPRyRDEY3ChyDLdFjR_3g5BoHkPBm3/s400/mystery-black-piece3.jpg)