Dating dinosaurs and other old things
Pick up just about any book on dinosaurs, and it will say that dinosaurs lived from million to 65 million years ago. The ages of dinosaur fossils are determined by the layer of rock in which they are found. How do they know how old the rock layer is? It is usually the case that when layers of rock are piled up upon each other, the bottom one is the oldest, and the top one is the youngest, because the bottom one had to be there before the other ones formed on top of it. The exceptional case is the one in which liquid rock squeezes up through some layers. In that case, the liquid rock hardens into a solid rock formation that is younger than the layers above and below it.
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How Do Scientists Determine the Age of Dinosaur Bones?
DATING DINOSAURS AND OTHER OLD THINGS by Karen Liptak | Kirkus Reviews
A fossil from Classical Latin fossilis ; literally, "obtained by digging"  is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons , stone imprints of animals or microbes , objects preserved in amber , hair, petrified wood , oil, coal, and DNA remnants. The totality of fossils is known as the fossil record. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the absolute ages of rocks and the fossils they host. There are many processes that lead to fossilization, including permineralization , casts and molds, authigenic mineralization , replacement and recrystallization, adpression, carbonization , and bioimmuration. A fossil normally preserves only a portion of the deceased organism, usually that portion that was partially mineralized during life, such as the bones and teeth of vertebrates , or the chitinous or calcareous exoskeletons of invertebrates.
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Carbondated dinosaur bones are less than 40, years old. Researchers have found a reason for the puzzling survival of soft tissue and collagen in dinosaur bones - the bones are younger than anyone ever guessed. Carbon C dating of multiple samples of bone from 8 dinosaurs found in Texas, Alaska, Colorado, and Montana revealed that they are only 22, to 39, years old.
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