Massive Tyrannosaur Fossil Discovered in New Mexico

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Paleontologists have uncovered a remarkable fossil discovery in New Mexico - the shinbone of a massive tyrannosaur that lived around 74 million years ago. Estimated to have weighed around 4,700 kilograms, this prehistoric giant is the largest tyrannosaur found from the Late Campanian period, providing new insights into the evolution of these iconic predators.

Why it matters

This fossil find is significant because it sheds light on the origins and diversity of tyrannosaurs, one of the most famous dinosaur groups. The size and physical features of the bone suggest this ancient giant was closely related to Tyrannosaurus rex, potentially representing an 'older brother' in the tyrannosaur family tree. The discovery also supports the hypothesis that large tyrannosaurids first appeared in North America during the late Campanian period.

The details

The fossilized shinbone, estimated to be around 74 million years old, was discovered within the Kirtland Foundation in New Mexico. Analysis of the bone's robust and straight-shafted structure, as well as its broad, triangular shape at the foot end, suggests a close relationship to Tyrannosaurus. While not as massive as the largest known tyrannosaurids, this prehistoric giant is still estimated to have weighed around 4,700 kilograms, comparable to a large male African bush elephant.

• The fossil dates back to the Late Campanian period, approximately 74 million years ago.

What’s next

Paleontologists will continue to study the fossil to determine its exact position within the tyrannosaur family tree and better understand the evolution of these iconic predators.