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Relative age dating and absolute age dating

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Techniques such as radioactive dating, including carbon dating, focus more on the absolute age of an object.

An example of this type of aging includes rocks in Canada that scientists identified as being hundreds of million years old.

There's no absolute age-dating method that works from orbit, and although scientists are working on age-dating instruments small enough to fly on a lander (I'm looking at you, Barbara Cohen), nothing has launched yet. Relative age dating has given us the names we use for the major and minor geologic time periods we use to split up the history of Earth and all the other planets.

When you talk about the Precambrian, Paleozoic, Mesozoic, and Cenozoic on Earth, or the Noachian, Hesperian, and Amazonian for Mars, these are all relative ages.

Sometimes beds of rock can turn over the other way, so be very cautious when relatively dating rocks!

A few days ago, I wrote a post about the basins of the Moon -- a result of a trip down a rabbit hole of book research.

Absolute dating is the process of determining an age on a specified chronology in archaeology and geology.

Relative-age time periods are what make up the Geologic Time Scale.

The Geologic Time Scale is up there with the Periodic Table of Elements as one of those iconic, almost talismanic scientific charts.

There are absolute ages and there are relative ages. We use a variety of laboratory techniques to figure out absolute ages of rocks, often having to do with the known rates of decay of radioactive elements into detectable daughter products.

Unfortunately, those methods don't work on all rocks, and they don't work at all if you don't have rocks in the laboratory to age-date. They are descriptions of how one rock or event is older or younger than another.

Relative age will require the comparison of two or more objects, whereas absolute age does not.

Continue Reading Relative age comes up often in various fields, such as archeology.

The base layer must come first, then the second and then the third.

So I can say the second layer is younger than the first and older than the third but I have no idea whether the cake is 5 minutes or 5 million years old.

An absolute age is one determined usually by mass-spectrometry where an isotope is measured and then an age can be calculated (a very very basic explanation).

So in the end you can say this fossil is 50 thousand years old (always with an associated uncertainty).