1)    Tinker, the worlds first and most complete juvenile Trex  

 In 1902, Barnum Brown from the American Museum of Natural History undertook the first paleontological survey of sedimentary rocks, which he would later name the Hell Creek Beds. Soon after beginning exploration, Brown discovered that the Hell Creek Formation contained a well preserved dinosaur fauna that included Triceratops, Anatosaurs and the type specimen of Tyrannosaurus rex.

            Between 1902 and 1908, Brown excavated two partial skeletons of Tyrannosaurus  rex that were displayed at the Carnegie Museum and the American Museum which brought him fame as a dinosaur paleontologist. Numerous types of dinosaurs have been collected from the Hell Creek Formation since the early 1900’s and the formation is now widely recognized as one of the world’s great dinosaur graveyards, containing a divers assemblage of theropods, ornithopods, pachycephalosaurs, ankylosaurs and ceratopsids. (Lofgren, 1997)

Description:

            Tyrannosaurus rex (Juvenile) -Osborn, 1905    Dinosauria:Saurischia: Theropoda:Tyrannosauridae

            Tyrannosaurus is defined by having a snout that is well differentiated from the rest of the skull, a descending process of the postorbital that extends into the orbit, a rugose lachrymal horn that is very low, a rugose postorbital horn, a pro-maxillary fenestra that is invisible from the side, a wedge shaped prefrontal between the lachrymal and the fused frontals, swollen ectopterygoids with a very large sinus opening, a well developed notch on the front margin of the preacetabular blade of the ilium, a slender preacetabular blade of the ilium, a single carpal and a pronounced curve in the pubis (Carpenter, 1992)