A recent study on a giant shinbone has shed light on the history of one of North America’s oldest known tyrannosaurs. This dinosaur could be a massive predecessor of the famous Tyrannosaurus rex, with its fossil dating back about 74 million years to the Late Campanian period.
The shinbone was discovered at the Kirtland Foundation in New Mexico in the 1980s. What makes this find so intriguing is its size—it measures 84% of the length and 78% of the width of the largest known T. rex, famously named Sue. Researchers, led by paleontologist Nicholas Longrich from the University of Bath, estimate this ancient beast weighed around 4,700 kilograms, roughly the same as a hefty African bush elephant.
This analysis hints that large tyrannosaurs may have appeared much earlier than we previously thought. Some experts suggest that T. rex might have originated in Asia, while others believe it emerged in North America, particularly in a region called Laramidia. Longrich and his team note that if Tyrannosaurus evolved in this southern area, we should uncover more evidence through future fossil studies.
The age of the shinbone was determined using argon isotopes found in volcanic ash, ensuring the fossil’s remarkable age. Notably, the fossil’s unique traits resemble those of Tyrannosaurus, especially the robust and straight structure of the bone. This finding is significant; it suggests that large tyrannosaurs evolved earlier than we believed and potentially in different parts of North America.
While only one bone been found so far, it opens up exciting possibilities for future research. Scientists hope to find more remains that could clarify the dinosaur’s place in the family tree. If further discoveries confirm these findings, they could reshape our understanding of dinosaur evolution and distribution.
The study has sparked interest online, with many discussing the implications of this discovery on social media platforms. It not only adds to our knowledge of dinosaurs but also raises questions about how these impressive creatures adapted to their environments millions of years ago.
This research was published in Scientific Reports and offers a glimpse into the fascinating world of paleontology. For more on the findings, you can read the full article here.
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