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To date this trilobite is considered to be the Largest known to have lived on the North American Continent
oil-bearing shale or slate at Holzmaden
approximately 58 cm (23 in) overall length
it is compressed slightly
Stegoceras, skull & jaws (Pachycephalosaurus) Dimorphodon To date this trilobite isPronounced STEG oh CEER us, Stegoceras (meaning "roofed horn") was a bipedal, herbivorous, dome headed, plant eating dinosaur from the late Cretaceous period, about 76 65 million years ago. This pachycephalosuar was about 7 ft (2 m) long and lived in what is now Alberta, Canada. The type species is P. validum. Stegoceras was named by paleontologist L. Lambe in 1902. It had long been thought that Stegoceras' (and other pachycephalosaurs') thick dome