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U
Uranium it is a radioactive element; over time, it slowly changes into the element lead. It can be used to date early rock layers.
Unearthed it is used to remove dirt, soil and rocks in order to expose something
Ultrasauros was a huge, long-necked, long-tailed sauropod dinosaur from the Jurassic era. It may essentially be a Brachiosaurus plus a Supersaurus fossild found collectively.
Unenlagia was a bird-like dinosaur from the mid-Cretaceous era.
Utahraptor was a large, frightening predator with 9-inch-long toe claws. This premature dromaeosaurid dinosaur was about 16-23 feet (5-7 m) long and dates from the mid-Cretaceous era, about 125 million years back.
