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Killer Dinosaur That Preceded T. Rex Found in Utah

The two-legged anima was more than 30 feet long and weighed more than 4 tons

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    The Field Museum
    This undated artist rendering provided by The Field Museum shows a newly discovered dinosaur named Siats meekerorum. Researchers at The Field Museum, the North Carolina Museum of Natural Sciences, and North Carolina State University discovered the giant predatory dinosaur that walked the Earth approximately 100 million years ago, in the Cedar Mountain Formation in Utah. The new dinosaur is the first of its kind to be discovered in North America. The study appears in the Nov. 22, 2013 issue of Nature Communications.

    Scientists have discovered a killer dinosaur that roamed in what is now Utah some 100 million years ago. Experts say the discovery provides insight into the top predators in North America before T. rex showed up.

    The two-legged anima was more than 30 feet long and weighed more than 4 tons. It helps fill a gap in the fossil record of North American big predators before the arrival of the group including T. rex. It wasn't related to that famous beast.

    Researchers from the Field Museum in Chicago and the North Carolina Museum of Natural Sciences in Raleigh announced the finding Friday in the journal Nature Communications. They named the beast "Siats meekerorum," after a legend of Utah's Ute tribe and a family that has donated to the Field Museum.