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In North America, Ernst Antevs has made several attempts to relate Pleistocene geological formations in the American Southwest to events that produced varves in the northern parts of North America.
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Second, many of the Pleistocene glacial areas has receded nowadays and affecting the supply of sediments.
Therefore outside Scandinavia it is difficult to find continuous sequence of varves reaching the present.
Archaeologists use several methods to assign ages to events of the past.
They are engaged in defining the stages of hominid evolution and their artifactual record, and the assignment of a chronology to these stages.
Any piece of wood from the present day backwards will usually overlap its tree ring pattern with an older piece - e.g.