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Students should be able to understand the principles and have that as a background so that age determinations by paleontologists and geologists don't seem like black magic. Geologists in the late 18th and early 19th century studied rock layers and the fossils in them to determine relative age.

William Smith was one of the most important scientists from this time who helped to develop knowledge of the succession of different fossils by studying their distribution through the sequence of sedimentary rocks in southern England.

Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.

We can see how do deal with this if we take a particular case. For example the amount of Rb in mantle rocks is generally low, i.e. The mantle thus has a low If these two independent dates are the same, we say they are concordant.

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co.

Students not only want to know how old a fossil is, but they want to know how that age was determined.

Some very straightforward principles are used to determine the age of fossils.

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