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It is effective on timescales of several millions of years.
Introduction to dating glacial sediments
Radiocarbon dating Dating sediments the decay of Carbon within organic matter. Organic matter needs to have been buried and preserved for this technique. It is effective for up to the last 40, years. It assumes that organic material is not contaminated with older radiocarbon which, for example, is a common problem with organic material from marine sediment cores around Antarctica. Amino Acid Racemisation dates the decay and change in proteins in organisms such as shells. Optically Stimulated Luminescence dates the radiation accumulated in quartz or feldspar grains within sand.
The radiation emanates from radioactive grains within the sediment, such as zircons. 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. Dinosaur bones, on the other hand, are millions of years old -- some fossils are billions of years old.
To determine the ages of these specimens, scientists need Dating sediments isotope with a very long half-life. Some of the isotopes used for this purpose are uranium, uranium and potassium, each of which has a half-life of more than a million years. Unfortunately, these elements don't exist in dinosaur fossils themselves. Each of them typically exists in igneous rock, or rock made from cooled magma. Atti del Convengo sull' eutrofizzazione in Italia. Phytoplankton productivity in lake Lugano before water treatment. Chemical characteristics of lake Lugano sediments. Interaction between sediments and freshwater. Google Scholar Robbins, J.
Stratigraphic and dynamic effects of sediment reworkings by Great Lakes' zoobenthos. Google Scholar Schneider, J. Die Sedimente des Traunsees. Google Scholar Steger, F. Google Scholar Sturm, M. Limnologische Untersuchung Traunsee-Traun, Ber. Google Scholar Vernet, J. Texture and sedimentation rates in lake Geneva.