A newfound "chicken-size" dinosaur, recently unearthed in Wyoming, changes what paleontologists thought they knew about how dinosaurs spread across the globe ... in North America — and one ...

A 230 million-year-old, never-before-seen raptor unearthed in the U.S. is the oldest dinosaur ever discovered in North ...

T. rex evolved in North America from Asian ancestors. Climate shifts and extinction events helped tyrannosaurids and ...

The oldest crust on Earth, known to be unchanging, is actually being altered in real time. The North American continent is "dripping" rock into the lower layers of the Earth, new research says ...

Lead author Cassius Morrison, a Ph.D. student at UCL Earth Sciences ... light on how the largest tyrannosaurs appeared in North and South America during the Cretaceous and how and why they ...

This map shows seismic speed in the Earth’s crust at 200 kilometers depth across the continental United States and portions of Central America and Canada. The North American craton (outlined in ...

A map showing seismic speed in Earth’s crust at 125 miles (201 km) depth across the continental U.S. and portions of Central America and Canada. The North American craton (outlined in black ...