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Relative Dating of Rock Layers
But when laid on the ground, they are fixed to the position that the north magnetic pole was at the time. Carbon, though, is continuously created through collisions of neutrons generated by cosmic rays with nitrogen in the upper atmosphere and thus remains at a near-constant level on Earth. Instead, they are a consequence of background radiation on certain minerals. The fossil record prior to this period is very scarce. The final decay product, lead Pb , is stable and can no longer undergo spontaneous radioactive decay. Depending on the context of the site, you may discard some dates to reach a final dating. A layer with many pieces of a particular style will be represented by a wide band on the graph, and a layer with only a few pieces will be represented by a narrow band. Rubidium—strontium dating This is based on the beta decay of rubidium to strontium , with a half-life of 50 billion years. With potassium-argon dating, scientists can figure out the age of samples that are billions of years old. One of the advantages of fission track dating is that it has an enormous dating range. Plants get most of their carbon from the air in the form of carbon dioxide , and animals get most of their carbon from plants or from animals that eat plants. Rubidium-strontium dating is not as precise as the uranium-lead method, with errors of 30 to 50 million years for a 3-billion-year-old sample.
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