Scientists date back fossil of largest raptor dinosaur to 135 million years
Uranium/lead dating of zircon crystals and the relative abundance of two types of stable carbon isotopes found in buried organic matter were conducted to estimate the exact date.
| May 05, 2023 05:57 AM EST
Created: May 05, 2023 05:57 AM EST
Portrayal of Utahraptors and prey trapped in quicksand deposit of the Stikes Quarry bone bed at Utahraptor Ridge.