Location North America.svg          Utahraptor

Utahraptor (Utah predator) is a genus of theropod dinosaurs, including the largest known species of the family Dromaeosauridae. It is known from fragmentary skeletons such as skull fragments, a tibia, claws and some caudal (tail)vertebrae. The material shows a raptor about twice the length of Deinonychus. Like other dromaeosaurids,Utahraptor had large curved claws on their second toes. One claw found shows it at 22 centimetres (8.7 in) in length and is thought to reach 24 centimetres (9.4 in) restored.estimated to have reached up to 7 m (23 ft) long and somewhat less than 500 kg (1,100 lb) in weight, about the size of a grizzly bear.  Some undescribed specimens in the BYU collections may have reached up to 11 m (36 ft) long, though these need to undergo more detailed study. Although no feathers have ever been found with these skeletons, it is believed to have had feathers.

The largest reported in gray the largest described in green.

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Location North America.svg          Utahceratops

Utahceratops (utah horn face)  is a genus of herbivorous ceratopsian dinosaur.  Its fossils have been taken from the Kaiparowits Formation. Little is known from this dinosaur, but enough that I am writing about it. It was first named Utahceratops gettyi by Scott D. Sampson, Mark A. Loewen, Andrew A. Farke, Eric M. Roberts, Catherine A. Forster, Joshua A. Smith, and Alan L. Titus in 2010. They are estimated to have measured on average 2 metres (6.5 feet) in height, 6 to 7 metres (20 to 23 feet) in length, and  three to four metric tons in weight.

Known parts of Utahceratops shown in yellow.File:Utahceratops gettyi.pngFile:Skull reconstruction of Utahceratops gettyi.jpg

Reconstructed skeleton


Location North America.svg           Torvosaurus

Torvosaurus (savage lizard) is a genus of large theropod dinosaur that lived during the Late Jurassic period. Fossilized remains of Torvosaurus have been found in North America and PortugalTorvosaurus reached 9 to 11 meters (30 to 36 ft) in length and weighed about 2 metric tons (2.2 tons), which made it the largest carnivore of its time, except for Epanterias (which may have been just a big Allosaurus) and Saurophaganax. It was first discovered by Daniel and Vivian Jones, of Delta, Colorado, in the Morrison Formation at the Dry Mesa Quarry, Colorado in 1971 and dug up by James A. Jensen and Kenneth Stadtman in 1972. The size of Torvosaurus is not definitely known because only incomplete material has been found, but it was a large theropod. North American Torvosaurus material is estimated about 9.0 meters long (29 ft), and a weight of about 1.95 metric tons (2.15 tons). Material from Portugal shows even bigger animals. In 2006 a nearly complete maxilla found in Portugal was assigned to Torvosaurus tanneri. It measured 63 cm in length (2.13 ft), quite a bit larger than the 47 cm (1.54 ft) long maxilla of the American skeleton. Based on this, a skull length of 158 cm (5.18 ft) was estimated for the Portuguese specimen. This is comparable to the largest T. rex skulls, and makes Torvosaurus the largest known Jurassic theropod.File:Museum AL dinosaur.jpgFile:Torvosaurus tanneri.JPGFile:Torvosaurus tanner DBi.jpg


Location North America.svg                Titanoceratops

Titanoceratops (titan horn face) is a genus of herbivorous ceratopsian dinosaur. It was a giant chasmosaurine ceratopsian which lived during theLate Cretaceous period in what is now New Mexico, and the earliest known triceratopsin. It is known from a partial skeletons including partial skulls and jaws. The species was formally named by Nicholas R. Longrich in 2011 and the type species is Titanoceratops ouranos. Previously, its fossils were assigned to Pentaceratops. The skull is estimated to be 2.65 m (8.7 ft) long when complete, making it a candidate for the longest skull of any terrestrial vertebrate. It is extremely like Eotriceratops and Ojoceratops, and may be synonymous. File:Titanoceratops Samnoble.JPGFile:Titanoceratops NT.jpgFile:Titanoceratops.jpg


Location North America.svg          Thescelosaurus

Thescelosaurus was a genus of small ornithopod dinosaur that appeared at the very end of the Late Cretaceous period in North America. This ornithopod is known from several partial skeletons and skulls that indicate it grew to between 2.5 and 4.0 meters (8.2 to 13.1 ft) in length on average. Thescelosaurus was a heavily built bipedal animal, probably herbivorous, but possibly omnivorous. It had short, broad, five-fingered hands, four-toed feet with hoof-like toe tips, and a long tail.

File:Burpee - Thescelosaurus.JPGFile:Thescelosaurus BW3.jpgFile:Human-thescelosaurus size comparison.png


Tenontosaurus (sinew lizard) is a genus of medium- to large-sized ornithopod dinosaur. The genus contains two species, Tenontosaurus tilletti (described by John Ostrom in 1970) and Tenontosaurus dossi (described by Winkler, Murray, and Jacobs in 1997). It was about 6.5 to 8 metres (21 to 26 ft) long and 3 metres (9.8 ft) high in a bipedal stance, with a mass of somewhere between 1 to 2 tonnes (1 to 2 short tons). It had an unusually long, broad tail, which, like its back, was stiffened with a network of bony tendons.

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Location North America.svg                     Supersaurus

Supersaurus (super lizard) was a sauropod discovered in Delta, Colorado in 1972. It could have reached a length of 33 to 34 meters (108-112 feet) and weighed up to 35-40 tons. Paleontologist James A. Jensen, who described the original Supersaurus specimen, simultaneously reported the discovery of another gigantic sauropod, which would later be named “Ultrasaurus” macintoshi. However, paleontologists discovered that the bones of “Ultrasaurus” were actually Supersaurus bones.

File:Supersaurus.jpgFile:Supersaurus dinosaur.png


Location North America.svg                          Styracosaurus

Styracosaurus was a ceratopsian. It was a herbivore. Styracosaurus was a close relative of Triceratops. Styracosaurus was a relatively large dinosaur, reaching lengths of 5.5 metres (18 ft) and weighing nearly 3 tons. It stood about 1.8 meters (6 ft) tall. Styracosaurus possessed four short legs and a bulky body. Its tail was rather short. The skull had a beak and shearing cheek teeth arranged in continuous dental batteries, suggesting that the animal sliced up plants. Like other ceratopsians, this dinosaur may have been a herd animal, traveling in large groups, as suggested by bonebeds. Styracosaurus had many spikes that protruded from its frill. It also had a nose horn. Each of the four longest frill spines was comparable in length to the nose horn, at 50 to 55 centimetres long (19.7 to 21.7 in). Relatively, Styracosaurus looked like a giant Rhinoceros. Here are a couple of pictures.


   Location North America.svg                   Stygimoloch                        

                    Stygimoloch was a Pachycephalosaurid. It is currently known from the Hell Creek Formation, Ferris Formation, and Lance Formation of the Western Interior (United States), where it lived alongside Tyrannosaurus and Triceratops. It may represent a sub-adult form of Pachycephalosaurus. It is a relatively large pachycephalosaur, with the skull being about 46 centimeters long (18 in). Among North American pachycephalosaurs, only Pachycephalosaurus is larger. Short  horns covered the nose, and the back corners of the skull had an enormous pair of massive, backward-pointing spikes, up to 5 centimeters in diameter (2 in) and 15 centimeters long (6 in). These were surrounded by two or three smaller spikes.

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