The Alamosaurus dinosaur came from the Late Cretaceous Period and originated in the southern part of North America. This creature went extinct roughly 66 million years ago. Alamosaurus was discovered in 1922 in the Ojo Alamo Formation in New Mexico.
Based on its fossils, the Alamosaurus was quite large. Paleontologists have named this dinosaur the largest dinosaur that dwelled in North America. Alamosaurus was roughly ninety-eight feet long and weighed over seventy tons. Its body was thought to be covered in bony armor. This big dinosaur was an herbivore and used its long neck to feast on ground plants. Experts believe that the Alamosaurus used its long tail as a whip.