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Dinosaurs are a diverse group of reptiles [note 1] of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago (mya), although the exact origin and timing of the evolution of dinosaurs is a subject of active research.
In the 135 years between Buckland's first discovery and 1969 a total of 170 dinosaur genera were described. In the 25 years after 1969 that number increased to 315. Much of this increase was due to the examination of new rock exposures, particularly in previously little-explored areas in South America and Africa. [ 82 ]
1669 — Nicolas Steno writes that some kinds of rock formed from layers of sediment deposited in water, and that fossils were organic remains buried in the process. [6] 1699 - Edward Lhuyd names the new sauropod genus and species "Ruttelum implicatum". By doing so, he names the first prehistoric creature that is recognizable as a dinosaur.
539 Ma – present. The Phanerozoic Eon (Greek: period of well-displayed life) marks the appearance in the fossil record of abundant, shell-forming and/or trace-making organisms. It is subdivided into three eras, the Paleozoic, Mesozoic and Cenozoic, with major mass extinctions at division points.
This week, meet the first dinosaur ever discovered, ... When massive fossilized bones were found jutting from the slate quarries in England’s Oxfordshire in the late 1600s, people thought they ...
Biology [1] Sir Richard Owen KCB FRMS FRS (20 July 1804 – 18 December 1892) was an English biologist, comparative anatomist and palaeontologist. Owen is generally considered to have been an outstanding naturalist with a remarkable gift for interpreting fossils. Owen produced a vast array of scientific work, but is probably best remembered ...
Dinosaurs were initially cold-blooded, but global warming 180 million years ago may have triggered the evolution of warm-blooded species, a new study found.
One archosaur group, the dinosaurs, were the dominant land vertebrates for the rest of the Mesozoic, [109] and birds evolved from one group of dinosaurs. [105] During this time mammals' ancestors survived only as small, mainly nocturnal insectivores, which may have accelerated the development of mammalian traits such as endothermy and hair. [110]