The fossil was discovered in Johnson County, Wyoming, which is one of seven US states the carnivores would have roamed in the Late Jurassic period between 145 and 161million years ago. This particular skeleton is estimated to be more than 150 million years old, measuring 11.5 ft high and 33 ft long.
The theropod dinosaur is not commonly uncovered by experts despite having frequented plains and lowland in North America in the Late Jurassic period. It was the most common large carnivore of the era in seven US states, including Utah, Colorado, Wyoming and Montana, with strong, three-fingered forelimbs and sharp claws.
It roamed what is now Montana between 85 and 66 million years ago. Fossils of small dinosaurs have also been unearthed in Nova Scotia that date back 200 million years to the early Jurassic period, while in northeastern British Columbia, paleontologist Rich McCrea has uncovered one of the world’s most diverse dinosaur trackways.
This dinosaur was a large carnivorous bipedal predator that scientists believe preyed on the many herbivores of the time. A five – foot – long neck vertebra indicates that the sauropod, which lived about 160 million years ago and whose fossilized bones are still being unearthed, was about 90 feet long and weighed perhaps 60,000 pounds, the scientists said.