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.
were found at the well-known Utahraptor Ridge site in Utah. This is the location of Stikes Quarry, part of the Cedar Mountain Formation. Interestingly, from this location, experts have uncovered several peculiar dinosaur fossils, and most of them were found to be in a good state.The Utahraptor fossils were found encased in the Yellow Cat Member rock layer of the Cedar Mountain Formation. The team examined this rock layer again to evaluate the age of the rock as well as the age of the fossils.
The findings revealed that the rocks at Stikes Quarry are at least 135 million years old, whereas it was previously estimated to be around 125 million years old. "Before, we had a 25-million-year gap between them. That's a third of the age of mammals, more than double the length of time for hominid evolution. It's a big chunk of time. Anything can happen over 25 million years if you have no record of what's going on.
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