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Parasaurolophus (/ ˌ p ær ə s ɔː ˈ r ɒ l ə f ə s,-ˌ s ɔːr ə ˈ l oʊ f ə s /; meaning "beside crested lizard" in reference to Saurolophus) [2] is a genus of hadrosaurid "duck-billed" dinosaur that lived in what is now western North America and possibly Asia during the Late Cretaceous period, about 76.9–73.5 million years ago. [3]
The ornithopod family, which includes genera such as Edmontosaurus and Parasaurolophus, was a common group of herbivores during the Late Cretaceous Period. [1] Hadrosaurids are descendants of the Late Jurassic / Early Cretaceous iguanodontian dinosaurs and had a similar body layout.
[1] in the Upper Cretaceous Period (mid to late Campanian), from 86.3 to 70.6 million years ago. [2] Maiasaura peeblesorum is the state fossil of Montana. The first remains of Maiasaura peeblesorum were discovered in the Two Medicine Formation near Chouteau, Montana in 1978 by Bynum, Montana resident Laurie Trexler. This holotype specimen was ...
The skeleton was articulated and only missing about the last 0.61 metres (2.0 ft) of the tail and front legs. [5] Both scapulae and coracoids are preserved in position, but the rest of the front legs are gone (except for phalanges and pieces of the humeri, ulnae, and radii). Apparently, the remaining front legs were weathered or eroded away. [5]
There is one definite example of a small derived sauropodomorph: Anchisaurus, under 50 kg (110 lb), even though it is closer to the sauropods than Plateosaurus and Riojasaurus, which were upwards of 1 t (0.98 long tons; 1.1 short tons) in weight. [51] Evolving from sauropodomorphs, the sauropods were huge.
Camarasaurus (/ ˌ k æ m ər ə ˈ s ɔː r ə s / KAM-ər-ə-SOR-əs) was a genus of quadrupedal, herbivorous dinosaurs and is the most common North American sauropod fossil. Its fossil remains have been found in the Morrison Formation, dating to the Late Jurassic epoch (Kimmeridgian to Tithonian stages), between 155 and 145 million years ago.
"Microcephale": Said to be an extremely small pachycephalosaur, with skull caps only 5 centimetres (2.0 in) long. Mojoceratops perifania: May be a synonym of Chasmosaurus. Nanotyrannus lancensis: Most likely a juvenile Tyrannosaurus, although a more recent study suggests it might be a possibly distinct taxon based on referred specimens.
This suggests it could not walk very fast, as the stride of the back legs at speed would have overtaken the front legs, giving a maximum speed of 15.3–17.9 km/h (9.5–11.1 mph). [72] [42] Tracks discovered by Matthew Mossbrucker (Morrison Natural History Museum, Colorado) suggest that Stegosaurus lived and traveled in multiple-age herds. One ...