1.9" Fossil Shrimp (Kallidecthes) Pos/Neg - Illinois

This is a 1.9" fossil shrimp (Lobetelson), preserved in an ironstone nodule, from the Carbondale Formation near Aurora, Illinois. This specimen is both the positive (convex) and negative (concave) sides of the fossil. It is very well preserved and shows abdominal scales, swimmerets and legs.