As paleontologists discover fossils in a rock layer, they can make assumptions based on present-day life-forms about the environmental conditions that existed at that time.
For instance, the discovery of a fern fossil would indicate a warm or temperate climate, adequate precipitation, and perhaps shade, all of which are conditions that support the growth of modern-day method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co.
1979, 1986 © Harper Collins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source (rā'dē-ŏm'ĭ-tər) A device used to detect or measure radiation.
For inorganic materials, such as rocks containing the radioactive isotope rubidium, the amount of the isotope in the object is compared to the amount of the isotope's decay products (in this case strontium).
For organic materials, the comparison is between the current ratio of a radioactive isotope to a stable isotope of the same element and the known ratio of the two isotopes in living organisms.
The dating of rocks (and also fossils and archeological remains) by the accurate determination of the quantities of a long-lived radioactive isotope and its stable decay product in a sample.
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