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Oklahoma was a terrestrial environment for most of the ensuing Mesozoic era. [3] The Late Triassic Dockum Group of western Oklahoma preserved remains of archosaurs and temnospondyls, although its fossil record is restricted to a narrow region of the panhandle and is far sparser than the equivalent records in Texas, New Mexico, and Arizona. [98]
Fossils may be found either associated with a geological formation or at a single geographic site. Geological formations consist of rock that was deposited during a specific period of time. They usually extend for large areas, and sometimes there are different important sites in which the same formation is exposed.
Life restoration of the Early Cretaceous theropod dinosaur Acrocanthosaurus †Acrocanthosaurus – type locality for genus †Acrocanthosaurus atokensis – type locality for species †Albanerpeton †Albanerpeton arthridion †Allosaurus – type locality for genus †Allosaurus fragilis – type locality for species; Ammobaculites
The earliest-known dinosaur fossils date to roughly 230 million years ago, including Eoraptor and Herrerasaurus from Argentina, Saturnalia from southern Brazil and Mbiresaurus from Zimbabwe.
Neanderthal fossils were discovered in 1856, but at the time it was not clear that they represented a different species from modern humans. Eugene Dubois created a sensation with his discovery of Java Man, the first fossil evidence of a species that seemed clearly intermediate between humans and apes, in 1891. [79]
Researchers estimated the age of the newly discovered fossil to be around 70 to 72 million years old, but Titanosaurs roamed around on four legs from the Late Jurassic Epoch to the end of the ...
A rare fossil of an adolescent Tyrannosaurus rex has been excavated in North Dakota's badlands - a find noteworthy for the scientific insight it may offer into the life history of this famous ...
The year after the Hadrosaurus's fossils were first identified, 1859, state agricultural chemist Philip T. Tyson found the first documented dinosaur fossils of the Arundel Formation in an iron pit at Bladensburg, Maryland. [43] The discovery consisted of two fossil teeth. Tyson took the dinosaur teeth to a local doctor named Christopher Johnston.