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Senter, Philip J. – American Biology Teacher, 2022
Evidence from isotopes other than radiocarbon shows that dinosaur fossils are millions of years old. Despite that, bone mineral from Mesozoic dinosaur fossils yields a falsely young radiocarbon "date" of less than 50,000 years, due to its accumulation of new radiocarbon via recrystallization. Similarly, the so-called collagen fraction of…
Descriptors: Paleontology, Biology, Science Instruction, Measurement Techniques
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Senter, Philip J. – American Biology Teacher, 2021
The recent discovery of preserved cells and soft tissues in certain dinosaur bones seems incompatible with an age of millions of years, given the expectation that cells and soft tissues should have decayed away after millions of years. However, evidence from radiometric dating shows that dinosaur fossils are indeed millions of years old. Under…
Descriptors: Science Instruction, Paleontology, Evaluation, Creationism
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Senter, Philip J. – American Biology Teacher, 2020
The recent discovery of radiocarbon in dinosaur bones at first seems incompatible with an age of millions of years, due to the short half-life of radiocarbon. However, evidence from isotopes other than radiocarbon shows that dinosaur fossils are indeed millions of years old. Fossil bone incorporates new radiocarbon by means of recrystallization…
Descriptors: Paleontology, Science Instruction, Biology, Evolution