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Scientists say they've discovered Washington state's first dinosaur fossil. The announcement marks a unique find for the state. It is a rare moment for North America's Pacific coast.
Paleontologists at Seattle's Burke Museum have been studying the fossil. They said that the bone fragment is 80 million years old. It probably belonged to an older, smaller cousin of the Tyrannosaurus rex.
Dinosaur fossils are particularly rare along this side of the continent. Isolated skeletons and bones have been discovered. But it's happened at about only 10 sites near the shoreline.
Scientists think Earth's continents have shifted since dinosaurs roamed. They roamed the Earth 240 million to 66 million years ago. The researchers theorize that the area could have been underwater or otherwise uninhabitable.
Washington state's first dinosaur comes a little more than a year after a 16,000-year-old mammoth tusk was found. It was located at a Seattle construction site.
The bone fragment was uncovered at Sucia Island State Park. That is on the San Juan Islands. It comes from the late Cretaceous period. The findings were detailed online in the science journal PLOS ONE.
Researchers have been examining the nearly 17-inch-long, 9-inch-wide fragment. They've had it for about three years. They say it probably came from a 3-foot thigh bone.
Scientists haven't been able to identify what specific dinosaur the fossil comes from. It's just a fragment. They're certain it belonged to a theropod. That's a group of two-legged carnivores. That is a dinosaur that ate meat.
The creature probably died on land. Then it likely washed out to sea. There, it took a beating, scientists say. The fragment was the only fossil uncovered at the site.
"This fossil won't win a beauty contest," Christian Sidor said. He is the Burke paleontologist who co-wrote the journal article. "But fortunately it preserves enough anatomy that we were able to compare it to other dinosaurs. And be confident of its identification."
Critical thinking challenge: Why are fossils rare along this side of the continent?