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The chances of fossilization are very slim, because it requires that the remains be quickly buried and be kept in an oxygen-free environment.Scavenger and bacterial activity must be prevented so that decomposition is limited.When information derived from two outcrops is integrated, the time interval they represent is probably greater than that of each alone.Presumably if all the world’s outcrops were integrated, sediments representing all of geologic time would be available for examination.As the earth builds up layers, one on top of the other, the newest and youngest layers are on the surface.As you move down from the surface, the layers get progressively older.Non-radiometric methods utilize other processes to assess a date.

While early hominids likely lived throughout the entire continent, it is in the specific regions where paleoanthropologists have had the most success at discovering fossils.

These specific required conditions explain why fossils are so rare. : The Making of the Biological Past Response: Since fossilization requires very unique circumstances, fossils are very rare.

As a result, fossils do not necessarily provide a complete representation of the past.

They do not provide “exact” dates for the materials.

Relative methods include stratigraphic correlation, which matches strata from different sites that are temporally comparable.