Urchin Feeding Trace next to Lumbricaria - Solnhoffen Limestone, Germany

Although this isn't really a fossil within a fossil, it is a trace fossil next to another trace fossil. In the circled area just above a rather substantial pile of coprolite, is what is thought to be a feeding trace left by a sea urchin. Long, stringy coprolites such as those show are classified Lumbricaria intestinum, which comes from the Latin word lumbricus, meaning "earthworm." They are thought to have originated from cephalopods including squid, ammonites, and cuddlefish. The modern octopus produces similar fecal extrusions.

Age: Jurassic - Kimmeridgian
Formation: Solnhofen Limestone (Plattenkalk)

Location: Eichstätt, Bavaria, Germany