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Dating of fossils

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Grand Canyon has so much more than pretty scenery. It contains an amazing diversity of rock formations with an abundance of fossils hidden within. What about dinosaur fossils? Not at Grand Canyon!
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DK Science: Dating Fossils

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Fossils - Grand Canyon National Park (U.S. National Park Service)

The age of fossils can be determined using stratigraphy, biostratigraphy, and radiocarbon dating. Paleontology seeks to map out how life evolved across geologic time. A substantial hurdle is the difficulty of working out fossil ages. There are several different methods for estimating the ages of fossils, including:.
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18.5D: Carbon Dating and Estimating Fossil Age

ICR researchers continue to look for radiocarbon in ancient carbon-containing Earth materials. Archaeologists commonly use carbon, or radiocarbon, to estimate ages for organic artifacts. No measurable amounts should exist in samples older than about , years because radiocarbon atoms would decay into nitrogen before then. Secular scientists published dozens of carbon measurements from samples considered much older than , years long before the RATE scientists found their examples, but so far few efforts have systematically explored radiocarbon in Mesozoic fossils.
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This diagram shows a selection of rock layers, also known as stratigraphic columns, from Koobi Fora. Lake Turkana has a geologic history that helped keep fossils intact. Scientists suggest that the lake as it appears today has only been around for about , years. The current environment around Lake Turkana is very dry. Over the course of time, though, the area has seen many changes.
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