Pachycephalosaurus wyomingensis and Pterodactylus

As displayed at the Graves Museum of Paleontology and Natural History, Dania, Florida, USA



Pachycephalosaurus wyomingensis
Pachycephalosaurus wyomingensis is an ornithischian found by Michael Triebold in Harding County, South Dakota in the Hell Creek Formation. This is from the upper Cretaceous (late Maastrichtian, 68 - 65 mya.). This specimen included the first nearly complete lower jaw, as well as most of the skull, some cervical, some dorsal, and a caudal vertebrae. Other bones were a humerus, femur, metapodials, and podials. There are three kinds of teeth found in the mouth, the 'Troödon'-type tooth is one. The ridge at the rear of the skull (squamosal bone) shows it to be a marginocephalian, a group which includes the ceratopians (e.g.Triceratops). The series of spikes at the rear of the skull may indicate sexual dimorphism.
[silhouette of Pachy] [head, frontal] [head, left lateral] [head, frontal oblique]
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[toothy grin] [toothy silhouette] [neck posterior cranium] [atlas axis cranium]
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[lower leg] [foot] [hand] [sacral view]
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Pterodactylus
Pterodactylus a pterosaur, not a dinosaur, but related to dinosaurs, is from the Bavarian quarry of Solnhofen, Germany, a fine-grained lithographic sandstone, much like the background of this page, from the end of the Jurrasic (150- mya.). Achaeopteryx, a finely feathered fossil was found flattened nearby.
[flying reptile - pterodactyl part and counter part] [flying reptile - pterodactyl part and counter part]
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