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Later in the 19th century pterosaurs were discovered in North America as well, the first of which was a spectacular animal named Pteranodon by paleontologist Othniel Charles Marsh. [7] Various aspects of pterosaur biology invited controversy from the beginning.
Obamadon is an extinct genus of polyglyphanodontian lizards from the Late Cretaceous of North America. Fossils have been found in the Hell Creek Formation of Montana and the Lance Formation of Wyoming. Researchers describe it as being distinguished by its "tall, slender teeth with large central cusps separated from small accessory cusps by ...
The first reasonably correct identification of a vertebrate fossil in North America was made in 1725, at a South Carolina plantation called Stono. [7] There slaves had uncovered several large fossil teeth while digging in a swamp. The slaves unanimously identified the teeth as elephant molars, which they would have recognized from life in Africa.
The oldest undisputed lizards date to the Middle Jurassic, from remains found In Europe, Asia and North Africa. [55] Lizard morphological and ecological diversity substantially increased over the course of the Cretaceous. [56] In the Palaeogene, lizard body sizes in North America peaked during the middle of the period. [57]
Hadrosaurus (/ ˌ h æ d r ə ˈ s ɔːr ə s /; lit. ' bulky lizard ') is a genus of hadrosaurid ornithopod dinosaurs that lived in North America during the Late Cretaceous Period in what is now the Woodbury Formation in New Jersey about 83.6 to 77.9 Ma.
Paleontologists have found that at the start of the Paleozoic era, what is now "North" America was actually in the southern hemisphere. Marine life flourished in the country's many seas. Later the seas were largely replaced by swamps, home to amphibians and early reptiles. When the continents had assembled into Pangaea drier conditions prevailed.
Recently discovered evidence supports the conclusion that brachiosaurids existed outside of North America in lower latitudes of Gondwana in the Early Cretaceous. [3] In 2013, Mannion et al. reported on the discovery of two isolated teeth found in Lebanon from the Early Cretaceous that possess posteriorly twisted crowns, which are characteristic ...
Acrocanthosaurus (/ ˌ æ k r oʊ ˌ k æ n θ ə ˈ s ɔːr ə s / AK-roh-KAN-thə-SOR-əs; lit. ' high-spined lizard ') is a genus of carcharodontosaurid dinosaur that existed in what is now North America during the Aptian and early Albian stages of the Early Cretaceous, from 113 to 110 million years ago.