Diversification of a group of plants or animals caused by environmental change such as flooding of vast areas around the continents, creating seas depth lacking, is called adaptive radiation, usually being followed by the evolution of a large number of new forms of life, perfectly adapted to the new living environment that surrounds them.
Paleontologists have tried to explain the causes of rapid development, especially during the periods most common of progressive evolution. They found that certain groups of fossils have evolved faster than others.Groups who had the fastest evolution were used for dating fossils. They allow determining the relative age of the zone or layer of rock in which they were found. Dating fossils are characteristic of a single layer of rocks. For example, trilobites fossils, which have been rapidly evolving, are considered fossils dating of Paleozoic era, while Ammonites have the same function for Mesozoic era rocks.
However, some scientists believe that the rate of evolution of certain groups may appear higher than others because they have several characteristics that can vary.
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