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Dating dinosaurs bones

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On the Atlantic coast of the U. In Morocco, paleontologists excavated the fossils of a dinosaur that roamed Earth million years ago. How did the researchers determine these ages? When examining remnants from the past, experts use radiometric dating, a versatile technique that involves counting radioactive atoms of certain elements that are still present in a sample. The particular elements studied, as well as the details of the process, depend on the approximate age of the object that scientists hope to date.
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How To ‘Date’ A Dinosaur Fossil

Dating dinosaurs bones
Dating dinosaurs bones
Dating dinosaurs bones
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Young-Earth Creationism and Dinosaur Tissues | HowStuffWorks

Othniel Charles Marsh described and named the first-known species, A. Holland in Apatosaurus lived about to million years ago mya , during the late Kimmeridgian to early Tithonian age, and are now known from fossils in the Morrison Formation of modern-day Colorado , Oklahoma , New Mexico , Wyoming , and Utah in the United States. Apatosaurus had an average length of 21— The cervical vertebrae of Apatosaurus are less elongated and more heavily constructed than those of Diplodocus , a diplodocid like Apatosaurus , and the bones of the leg are much stockier despite being longer, implying that Apatosaurus was a more robust animal. The tail was held above the ground during normal locomotion.
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How did scientists find soft tissue in dinosaur fossils?

About million years ago--give or take a few million years--the first dinosaurs evolved from a population of archosaurs , the "ruling lizards" that shared the earth with a host of other reptiles, including therapsids and pelycosaurs. As a group, dinosaurs were defined by a set of mostly obscure anatomical features, but to simplify matters a bit, the main thing that distinguished them from their archosaur forebears was their erect posture either bipedal or quadrupedal , as evidenced by the shape and arrangement of their hip and leg bones. See also What Is the Definition of a Dinosaur? As with all such evolutionary transitions, it's impossible to identify the exact moment when the first true dinosaur walked the earth and left its archosaur ancestors in the dust. For example, the two-legged archosaur Marasuchus sometimes identified as Lagosuchus looked remarkably like an early dinosaur, and along with Saltopus and Procompsognathus inhabited that in-between "shadow zone" between these two forms of life.
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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 and They became the dominant terrestrial vertebrates after the Triassic—Jurassic extinction event Dinosaurs can therefore be divided into avian dinosaurs , or birds; and the extinct non-avian dinosaurs , which are all dinosaurs other than birds. Dinosaurs are a varied group of animals from taxonomic , morphological and ecological standpoints.
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