Relative and chronometric dating methods

14-Dec-2019 17:54

So, often layers of volcanic rocks above and below the layers containing fossils can be dated to provide a date range for the fossil containing rocks.The atoms in some chemical elements have different forms, called isotopes.The method begins with the careful drawing and description of strata (the geological or archaeological profile).The profile from one location is then compared with profiles from surrounding sites.Then after another 5,000 years half of the remaining parent isotope will have decayed.While people are most familiar with carbon dating, carbon dating is rarely applicable to fossils.However, as the basic principles of relative dating progressed during the course of the 19th cent., investigators were able to correctly determine the relative age of many archaeological and geological materials.

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Since the rock formation contains both types of fossils the ago of the rock formation must be in the overlapping date range of 415 to 420 million years.

There are two main methods determining a fossils age, relative dating and absolute dating.