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They showed that many supposedly interdependent developments had in fact developed...
The precise measure of geologic time has proven to be the essential tool for correlating the global tectonic processes that have taken place in the past.
Relative methods (stratigraphic, geomorphic, topographic) are sound and convincing.
Exhumed forms may complicate identification and relationships, for both epigene and etch forms have been buried, and exhumed, but in tectonically undisturbed areas, the higher surfaces are older than those preserved at lower levels. The relationship of surfaces with volcanic deposits, old shorelines, and genetically related sedimentary sequences provides sound ages, and correlation with dated duricrusts and faults is also useful.The atoms of some chemical elements have different forms, called isotopes.These break down over time in a process scientists call radioactive decay.View Full-Text This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. We report the first absolute dating for rock paintings by Andean hunter-gatherer groups.Although relative ages can generally be established on a local scale, the events recorded in rocks from different locations can be integrated into a picture of regional or global scale only if their sequence in time is firmly established.