Whats relative dating
Many different techniques can be used to measure bone fluoride content, but measurement by ion selective electrode is the easiest and simplest method available today.
Since relative dating can easily be verified by superposition (the younger bed over the older one), intrusion (the intrusive being younger than the intrusive rock), and use of index fossils (younger fossils in a rock layer make that layer younger than another containing older fossils), relative dating can be confirmed right at the field using one's direct observation.
"Instead of a shrew-like mammal meekly scurrying into the shadows of dinosaurs, this badger-sized mammal would've been a fearsome predator on the Late Cretaceous landscape — even for some dinosaurs." Researchers found the four fossil specimens in rock dating to about 69 million to 66 million years ago in the Hell Creek Formation.
Before these four individuals were unearthed, researchers knew about 60 species of metatherians (marsupials and their closest relatives) from the Cretaceous period (145.5 million to 65.5 million years ago) of North America.
In the science of geology, there are two main ways we use to describe how old a thing is or how long ago an event took place. When you say that I am 38 years old or that the dinosaurs died out 65 million years ago, or that the solar system formed 4.6 billion years ago, those are absolute ages.
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.
But most of these were fragments of jawbones or teeth, which provided only limited information about marsupial's closest relatives. In order to test the creature's bite force, the researchers took a computed tomography (CT) scan of the fossils, and determined where the jaw muscles would have attached to the skull.
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Absolute dating entails laboratory analysis of rock samples that will take a longer time.
Older specimens have higher fluoride contents than younger ones when burial conditions are identical.
The requirement of identical burial conditions means that fluoride dating works best when it is applied within a single site with little variation in soil chemistry.
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.
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.