US palaeontologists have unearthed fossil bones of the biggest dinosaur to ever live in North America.
The study, published this week in the journal Acta Palaeontologica Polonica, provides the evidence of a giant titanosaurian sauropod from the Upper Cretaceous of North America, and describes its two enormous vertebrae and a femur found in New Mexico from 2003 to 2006.
The authors of the study, Denver Fowler from Montana State University and Robert Sullivan from the State Museum of Pennsylvania, said that the bones belong to the sauropod dinosaur Alamosaurus sanjuanensis, which roamed the southwestern United States and Mexico about 69 million years ago.
“Alamosaurus has been known for some time, its remains were first described in 1922 from the Naashoibito beds of New Mexico. Since then, more bones have been discovered in New Mexico, Utah, some really nice material from Texas, and Mexico, including a few partial skeletons,” said Denver Fowler.
The enormity of the newly found bones puts A. sanjuanensishas in the same size league as other giant sauropods from South America, including Argentinosaurus which weighed about 70 tons, and is widely considered to be the biggest dinosaur of all.