Trilobites from Clarita, OK.

Kingdom:Animalia, Phylum: Arthropoda, SubPhylum: Schizoramia, SuperClass: Arachnomorpha

Trilobites are hard shelled, segmented creatures that existed over 520 million years ago in ancient seas. They went extinct before the dinosaurs were even in existence, and are one of the very earliest life-forms that we know about. Trilobite fossils are found on all the continents. There are over 20,000 species of Trilobites, and make up the most diverse class of extinct organisms. They range from very small, under a millimeter long, to over two feet long. Most are about an inch long, and have a three column segmented body. 
The specimens below come from Oklahoma, near Clarita, Coal Co., Oklahoma in the Haragan Formation/Hunton Group, part of the Devonian, better know as Black Cat Mountain. Bob Carrolls shop and quarry have been favorites for fossil hunters for several years. This area has produced many trilobite fossils and is know for at least two unique trilobites not found in other parts of the world. Huntonia huntonensis and Cordania falcata are common finds in the area.