Dating of fossils evolution
A fossil in an evolutionary sequence must have both the proper morphology (shape) to fit that sequence and an appropriate date to justify its position in that sequence.
Since the morphology of a fossil cannot be changed, it is obvious that the dating is the more subjective element of the two items.
Volcanic rocks – such as tuff and basalt – can be used in dating because they are formed at a particular moment in time, during an eruption.
Sedimentary rocks are rarely useful for dating because they are made up of bits of older rocks.
The subject may seem to be complicated, but it is not.These include radiometric dating of volcanic layers above or below the fossils or by comparisons to similar rocks and fossils of known ages.Knowing when a dinosaur or other animal lived is important because it helps us place them on the evolutionary family tree.We will begin this present chapter with an introduction and overview of some of the fossil problems.
Instead, other methods are used to work out a fossil’s age.magazine has been continuously published since 1978, we are publishing some of the articles from the archives for historical interest, such as this.