Dinosaur fossils dating

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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 million years ago; their dominance continued through the Jurassic and Cretaceous periods. The fossil record demonstrates that birds are modern feathered dinosaurs , having evolved from earlier theropods during the late Jurassic Period. As such, birds were the only dinosaur lineage to survive the Cretaceous—Paleogene extinction event 66 million years ago. Dinosaurs can therefore be divided into avian dinosaurs , or birds; and non-avian dinosaurs , which are all dinosaurs other than birds.
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Dating Dinosaur Fossils

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How Do Scientists Determine the Age of Dinosaur Bones? | HowStuffWorks

To know if carbon dating is accurate, we would have to know how much carbon was in the atmosphere in the beginning, and also how long it has been increasing, or decreasing. Since no one was there, no one knows for sure. It's like trying to figure out how long a candle has been burning, without knowing the rate at which it burns, or its original size. Living penguins have been carbon dated and the results said that they had died 8, years ago! This is just one of many inaccurate dates given by Carbon dating. The shells of living mollusks have been dated using the carbon 14 method, only to find that the method gave it a date as having been dead for 23, years!
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DK Science: Dating Fossils

The Age of Dinosaurs was so many millions of years ago that it is very difficult to date exactly. Scientists use two kinds of dating techniques to work out the age of rocks and fossils. The first method is called relative dating. This considers the positions of the different rocks in sequence in relation to each other and the different types of fossil that are found in them.
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The most widely known form of radiometric dating is carbon dating. This is what archaeologists use to determine the age of human-made artifacts. But carbon dating won't work on dinosaur bones. The half-life of carbon is only 5, years, so carbon dating is only effective on samples that are less than 50, years old.
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