Advantages of relative dating in geology
This method is based on the assumption (which nearly always holds true) that deeper layers of rock were deposited earlier in Earth's history, and thus are older than more shallow layers.The successive layers of rock represent successive intervals of time.
Similarly, pollen grains released by seed-bearing plants became fossilized in rock layers.Correlating two separated outcrops means establishing that they share certain characteristics indicative of contemporary formation.The most useful indication of time equivalence is similar fossil content, provided of course that such remains are present.For instance, if we find a fossil bone below the strata 3 rock level shown above, we assume that the animal most likely lived at a time before that layer was formed.However, we must be careful to note whether or not the fossil comes from the mixed strata zone of the filled in hole..The review you are about to read comes to you courtesy of H-Net -- its reviewers, review editors, and publishing staff.
If you appreciate this service, please consider donating to H-Net so we can continue to provide this service free of charge. Translate this review into As a practicing archaeologist who has been cross trained in several of the physical sciences and taught archaeological field methods and laboratory analyses at the university level, I approached an assessment of this work with great anticipation and, at the same time, hesitant caution.
Dating techniques are procedures used by scientists to determine the age of an object or a series of events.
The two main types of dating methods are relative and absolute.
Before the advent of absolute dating methods in the twentieth century, nearly all dating was relative.
The main relative dating method is stratigraphy (pronounced stra-TI-gra-fee), which is the study of layers of rocks or the objects embedded within those layers.
In the second section, I furnish a more technical and detailed appraisal of the each of the twelve chapters with comments about those major publications previously regarded by archaeologists as key sources on these specific topics.