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Temporal range: Upper Cretaceous
Perot Museum Alamosaurus and Tyrannosaurus.jpg
Restored skeletons of Alamosaurus and Tyrannosaurus at Perot Museum
Scientific classification
Kingdom: Animalia
Class: Sauropsida
Superorder: Dinosauria
Order: Saurischia
Suborder: Sauropodomorpha
Infraorder: Sauropoda
Family: Titanosauria
Subfamily: Saltasauridae
Genus: Alamosaurus

Alamosaurus was a titanosaur, a gigantic plant-eating dinosaur from the Upper Cretaceous period, about 73 million to 65 million years ago.

Alamosaurus was a long-necked, whip-tailed dinosaur. It was about 69 feet (21 m) long and weighed perhaps 33 tons (30000 kg). Fossils have been found in New Mexico, Texas, and Utah. Fossils include fragmentary skeletons (and no skulls).

Skeletal elements of Alamosaurus are among the most common Late Cretaceous dinosaur fossils found in the United States Southwest and are now used to define the fauna of that time and place. There was a climate change in this area, it became drier, and this caused changes in the fauna. Thomas M. Lehman describes it as "the abrupt reemergence of a fauna with a superficially 'Jurassic' aspect".[1] These faunas are dominated by Alamosaurus and feature abundant Quetzalcoatlus in Texas.[1] The AlamosaurusQuetzalcoatlus association probably represent semi-arid inland plains.[1]p201

References[change | change source]

  1. 1.0 1.1 1.2 Lehman T.M. 2001. Late Cretaceous dinosaur provinciality. In: Mesozoic vertebrate life, edited by Tanke D.H. and Carpenter K. Indiana University Press, pp. 310–328.