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Some of these criteria have turned out to be inconsistent, leading to conflict. To counter this, biostratigraphers search for a particularly well-preserved section that can be used as the type section for a particular biostratographic unit. Thermo-luminescence, Optically stimulated luminescence, and Electron spin resonance.
This method compares the amount of genetic difference between living organisms and computes an age based on well-tested rates of genetic mutation over time. The resolution of terrestrial fossil records have improved as the methods have improved. Titanotheres have since been found above the Chadron Formation, leaving the definition of the age uncertain. They are seldom evenly distributed through a section, and they tend to occur in isolated pockets with few overlaps between biozones. All of these methods measure the amount of electrons that get absorbed and trapped inside a rock or tooth over time.
There is no consensus for the names of some of the ages. Thus, correlations between biozones is often indirect, inferred using a knowledge of their sequence of evolution. South American land mammal age The development of South American land mammal ages is largely due to two brothers, Florentino Ameghino and Carlos Ameghino. It was based on sedimentary units near Villafranca d'Asti in Italy.
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