It's a small trilobite with raised eyes and spines coming off each side of the cephalon as well as one off the middle of the thorax. The specimen has been expertly prepped by Bob and looks like it is just resting before moving on.
The Haragan formation is Devonian in age (Lockhovian stage). The Bois d'Arc and Haragan formations interfinger with each other and are roughly the same age (Devonian, Lockhovian stage). They are both roughly correlative to the Helderberg fauna of New York and thus are contemporaneous with the Coyemans, Kalkberg and New Scotland formations.