Representation of Tyrannosaurus. Tyrannosaurus Tyrannosaurus (/tie-RAN-uh-SAWR-us/; “tyrant lizard”), often shortened to T. rex, is a genus of large theropod dinosaur and one of the most famous and well-studied prehistoric animals. It lived in what is now western North America—then an island continent known as Laramidia—during the Late Cretaceous period, roughly 68 to 66 million years […]
Tyrannotitan: Profile of a Prehistoric Giant Tyrannotitan Tyrannotitan (Tie-RAN-oh-TIE-tan; “Tyrant Titan”) is a genus of giant carcharodontosaurid theropod dinosaur that roamed the Earth during the Early Cretaceous period, approximately 118 to 112 million years ago. Its fossils were discovered in what is now Patagonia, Argentina, in South America. The name Tyrannotitan reflects its massive size,
Uberabatitan: Profile of a Prehistoric Giant Uberabatitan Uberabatitan (OO-beh-rah-bah-TIE-tan; “Uberaba titan”) is a genus of titanosaurian sauropod dinosaur that lived during the Late Cretaceous period, approximately 70 to 66 million years ago, in what is now Brazil. The name refers to the Uberaba region in Minas Gerais, Brazil, where its fossils were discovered, and “titan”
Udanoceratops: Profile of a Prehistoric Giant Udanoceratops Udanoceratops (OO-dah-noh-SEH-rah-tops; “Udan Sayr’s horned face”) is a genus of leptoceratopsid ceratopsian dinosaur that lived during the Late Cretaceous period, specifically the Campanian stage, about 80 million years ago. Its fossils were discovered in the Djadochta Formation at Udan Sayr in Mongolia. The name refers to this discovery
Uintaceratops: Profile of a Prehistoric Giant Uintaceratops Uintaceratops (YOO-in-tah-SEHR-ah-tops; “Uinta horned face”) is a genus of centrosaurine ceratopsid dinosaur thought to have lived during the Late Cretaceous period, approximately 78 to 77 million years ago (Campanian stage), in the region that is now Utah, North America. The name Uintaceratops combines “Uinta,” referring to a significant
Uintasaurus: Profile of a Prehistoric Giant Uintasaurus Uintasaurus (yoo-IN-tah-SAWR-us; “Uinta lizard” or “lizard from the Uinta region”) Uintasaurus is a genus of sauropod dinosaur that lived during the Late Jurassic period, approximately 155 to 150 million years ago. Its fossils were discovered in the Morrison Formation in Utah, USA. The name refers to the Uinta
Ultrasauros: Profile of a Prehistoric Giant Ultrasauros Ultrasauros (UL-tra-SAWR-us; “ultra lizard”) is a name once given to what was believed to be a new genus of gigantic sauropod dinosaur from the Late Jurassic period, approximately 154 to 150 million years ago. Fossils attributed to it were discovered in the Morrison Formation in Colorado, USA. The
Ultrasaurus: Profile of a Prehistoric Giant Ultrasaurus Ultrasaurus (UL-tra-SAWR-us; “Ultra lizard”) is a genus of sauropod dinosaur whose name has a complex history involving discoveries in both South Korea and the United States. The name was famously associated with what was thought to be one of the largest dinosaurs ever discovered, but this was later
Umarsaurus: Profile of a Prehistoric Giant Umarsaurus Umarsaurus (OO-mar-SAWR-us; “Umar’s lizard”) is a genus of ornithopod dinosaur that roamed the Earth during the Middle Jurassic period, approximately 170 to 165 million years ago. Fossils of Umarsaurus have been discovered in rock formations located in what is now Niger, Africa. The name honors Dr. Amina Umar,
Unaysaurus: Profile of a Prehistoric Giant Unaysaurus Unaysaurus (oo-NAI-sore-us; “black water lizard”) is a genus of basal sauropodomorph dinosaur that lived during the Late Triassic period, approximately 225 to 210 million years ago, in what is now southern Brazil. The name Unaysaurus comes from the Tupi language word “unay” (meaning “black water”) and the Greek
