Friday, November 16, 2012

Alamosaurus - Giant Titanosaur From North America

Alamosaurus - the largest known dinosaur of the United States?

During the Late Cretaceous of a land bridge between what would become North and South America allowed northward migration of Titanosaurs, dinosaurs with long necks. It was the first time perhaps in no less than 35 million years these huge animals were present in the region we now know as the United States.

Experienced several partial skeletons

Alamosaurus is known from several partial skeletons and many individual bones that were found in Mexico and the southwestern United States of Texas, New Mexico and Utah. He was one of the last sauropods living in North America and these types of dinosaurs may have been limited to the most southern part of the continent that the climate may be too cold for them further north. Curiously, the strata of Alaska, the same age as the rock formations that have yielded fossils Alamosaurus provided no evidence Titanosaurs living in regions further north on the continent. It has been suggested that the distribution of Titanosaurs may have been limited by the cooler climate.

Named Ninety Years Ago

Alamosaurus was named and described by American paleontologist Charles Whitney Gilmore in 1922. Although described as a large animal with an estimated size of twenty yards or more, recent fossil discoveries have suggested that animals may be much larger, perhaps rivaling some of the super-sized Titanosaurs known in South America in terms of their body size and total weight.

Contrary to popular belief, this dinosaur was not named after the Alamo mission, the site of a famous battle near San Antonio, Texas which took place in 1836. The genus name is derived from the Ojo Alamo Formation, the name of the geological formation where the fossils of this dinosaur were discovered. The word "alamo" is the Spanish term for a local poplar tree species which is common in this area.

Various fauna of the United States at the end of the Cretaceous

It seems that in the late Cretaceous fauna of the southern United States has been dominated by the ornithischian dinosaurs, primarily duckbill dinosaurs ceratopsians (horned dinosaurs such as Torosaurus), but there were sauropods present. Ornithomimid fuels (bird mimic) dinosaurs have been discovered in the Upper Cretaceous strata of this part of the world and the main predators were tyrannosaurs and smaller, agile dromaeosaurs. With forests of maple, chestnut, sycamore and birch of the flora would have looked very familiar to us. Dinosaurs like Alamosaurus would have looked quite incongruous in these familiar wooded environment.

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