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assume, incorrectly) to be many hundreds of thousands or millions of years old.

It appears that the researchers approached the matter with considerable professionalism, including taking great pains to eliminate contamination with modern carbon as a source of the C signal in the bones.Fossils may also consist of the marks left behind by the organism while it was alive, such as animal tracks or feces (coprolites).These types of fossil are called trace fossils (or ichnofossils), as opposed to body fossils. Clockwise from top left: Microraptor gui (a winged theropod), Apatosaurus louisae (a giant sauropod), Edmontosaurus regalis (a duck-billed ornithopod), Triceratops horridus (a horned ceratopsian), Stegosaurus stenops (a plated stegosaur), Pinacosaurus grangeri (an armored ankylosaur) Dinosaurs are a diverse group of reptiles of the clade Dinosauria that first appeared during the Triassic period.Although the exact origin and timing of the evolution of dinosaurs is the subject of active research, They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201 million years ago.

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