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Evolutionary dating methods

evolutionary dating methods-56

This lead to the recognition of one of the principles of geology, i.e., stratigraphy, older rocks lie below younger rocks and that fossils occur in a particular, predictable order.The next step was for geologists began to build up the stratigraphic column.

The next observation occurred when geologists noted how fossils became more complex through time.Phylogeny, mathematics, and other methods used to date fossils.Biologists now have at their disposal a variety of independent means to look at the history of life.At the oldest, or deepest layer of rock there was no record of fossils, but then they noticed that simple sea creatures were found at the next higher level, then more complex ones like fishes at the next higher level and so on.Next came life on land, then reptiles, then mammals, and finally humans.And this gave us the familiar list of divisions in the geologic time scale -- Jurassic, Cretaceous, Tertiary, and so on.

Most importantly, it was recognized that each time-unit was characterized by the appearance of particular fossils.

Any attempt to make a claim about evolution always comes back at some point to the geologic time scale.

But if you are going to be looking at time scales that are that old how do you get the dates?

Carbon Dating Carbon-14 dating is the best-known absolute dating technique.

This is the one preferred by archaeologists prefer to use.

Early geologists, at the end of the 18th and early 19th century noticed how fossils appeared in certain sequences: some fossil assemblages were always found below other assemblages, not above.