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22 million years
and Paranthropus boisei
The pectoral fins were narrow and pointed
Footprints are trace fossils
Stegoceras, skull dome (Pachycephalosaurus) Troodon 22 million yearsThis specimen is the dome made of very thick bone from the head of Stegoceras. It is removable from its base for study. 4 inches long 3 inches wide 2. 25 inches thick 7x6 inch matrix Pronounced 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,
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